Vulnerability-Lookup

CVE-2026-72796 (GCVE-0-2026-72796)

Vulnerability from cvelistv5 – Published: 2026-08-12 19:07 – Updated: 2026-08-14 16:52

Title

SiYuan before v3.7.4 Access Control Bypass via Static Routes

Summary

SiYuan before v3.7.4 contains an access control bypass vulnerability where static-file routes in the server mux bypass publish-access controls enforced on the REST API. Attackers with publish reader tokens or anonymous access in disabled-auth mode can read templates, snippets, and export artifacts by directly accessing static routes that lack the same restrictions as their REST API counterparts.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

5.8 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 19:47 UTC

CWE

CWE-862 - Missing Authorization

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 5852 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/siyuan-note/siyuan/security/ad…	vendor-advisory
https://www.vulncheck.com/advisories/siyuan-befor…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
siyuan-note	siyuan	Affected: 0 , < 3.7.4 (semver) Unaffected: 3.7.4 (semver) cpe:2.3:a:b3log:siyuan::::::::

Date Public

2026-07-25 00:00

Credits

Shirshakhtml

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-72796

Vulnerability from fkie_nvd - Published: 2026-08-12 20:17 - Updated: 2026-08-26 16:56

Severity

5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fgmr-7w36-9qfq
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/siyuan-before-access-control-bypass-via-static-routes

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-72796",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-12T19:47:52.179427Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-12T20:17:51.267",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fgmr-7w36-9qfq"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-access-control-bypass-via-static-routes"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Primary"
    }
  ]
}

GHSA-CM9F-W4H4-7J85

Vulnerability from github – Published: 2026-08-12 21:31 – Updated: 2026-09-04 21:02

Withdrawn 2026-09-04

Summary

Duplicate Advisory: Static-file routes bypass the publish-access controls enforced on the REST API, exposing templates, snippets and export artifacts to anonymous readers

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-fgmr-7w36-9qfq. This link is maintained to preserve external references.

Original Description

Severity

5.8 (Medium)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3.7.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-04T21:02:10Z",
    "nvd_published_at": "2026-08-12T20:17:51Z",
    "severity": "MODERATE"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-fgmr-7w36-9qfq. This link is maintained to preserve external references.\n\n## Original Description\nSiYuan before v3.7.4 contains an access control bypass vulnerability where static-file routes in the server mux bypass publish-access controls enforced on the REST API. Attackers with publish reader tokens or anonymous access in disabled-auth mode can read templates, snippets, and export artifacts by directly accessing static routes that lack the same restrictions as their REST API counterparts.",
  "id": "GHSA-cm9f-w4h4-7j85",
  "modified": "2026-09-04T21:02:10Z",
  "published": "2026-08-12T21:31:41Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fgmr-7w36-9qfq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72796"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-access-control-bypass-via-static-routes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Duplicate Advisory: Static-file routes bypass the publish-access controls enforced on the REST API, exposing templates, snippets and export artifacts to anonymous readers",
  "withdrawn": "2026-09-04T21:02:10Z"
}

GHSA-FGMR-7W36-9QFQ

Vulnerability from github – Published: 2026-09-04 21:02 – Updated: 2026-09-04 21:02

Summary

SiYuan: Static-file routes bypass the publish-access controls enforced on the REST API, exposing templates, snippets and export artifacts to anonymous readers

Details

CVE: This vulnerability corresponds to CVE-2026-72796.

Summary

Several static-file routes in the server mux (kernel/server/serve.go) are registered with CheckAuth only and serve directories directly, without the publish-access checks, sensitive-path blocklist, or refuseToAccess rules that the REST API applies to the same data. They are therefore reachable by the publish RoleReader token and by the anonymous account when Publish.Auth.Enable is false.

Most notably, /templates/ serves data/templates a directory the REST file API explicitly refuses to serve to non-administrators.

Details

Route	Registration	Guard	Exposed to a reader
`/templates/*` (line 424)	`Group("/templates/", model.CheckAuth).Static("", data/templates)`	none beyond path cleaning	the templates directory
`/snippets/*` (line 434)	`CheckAuth`	blocks only `conf.json`	any snippet's JS/CSS content by name
`/widgets/`, `/plugins/`, `/emojis/` (409/414/419)	`Group(CheckAuth).Static(dir)`	none	whole directory trees
`/export/*` (line 320)	`Group("/export/", CheckAuth)`	traversal, sensitive-path and DEK guards: no publish check	export artifacts (PDF/HTML/DOCX/CSV)

/templates/ directly contradicts an existing control. The REST file path runs refuseToAccess (kernel/api/file.go:551-553), which explicitly returns 403 for data/templates/ to non-administrators the project has already decided readers must not read templates. The /templates/ static route serves that same directory to any RoleReader, with no IsSensitivePath check, no publish-access check, and no refuseToAccess. Templates are user-authored Markdown documents containing template/Sprig syntax and are not covered by publish-access controls. gin's .Static disables directory listing, so a filename is required but the contradiction with refuseToAccess is the defect.

/export/ versus /assets/. /assets/*path (line 692) correctly gates non-administrators via CheckAbsPathAccessableByPublishAccess, plus IsSensitivePath and encrypted-asset handling. /export/ carries traversal, sensitive-path and DEK guards but no publish-access check, so a reader can retrieve export artifacts of arbitrary documents, including private ones. Artifact naming is mixed, some use a random export ID, but code and CSV exports use the document name (export/code/<name>, export/csv/<name>/<name>.csv), which a reader can derive from listDocsByPath titles while the artifact exists. This path is therefore conditional.

Confirmed correctly gated, for contrast: /assets/* (publish-gated), /history/* and /repo/diff/* (CheckAdminRole), /debug/pprof/* (disabled in production builds), /public/ (intentionally public).

All four routes above were verified to carry CheckAuth only, no CheckReadonly, no CheckAdminRole.

Proof of Concept

Precondition: publish mode enabled (default port 6808), anonymous when Publish.Auth.Enable is false, otherwise any publish reader account.

Templates: served despite the REST API refusing them:

GET http://127.0.0.1:6808/templates/<template-file>.md
→ 200, template content

The equivalent REST request is refused:

POST http://127.0.0.1:6808/api/file/getFile
{"path":"data/templates/<template-file>.md"}
→ 403 (refuseToAccess)

The same reader session obtains the file through the static route.

Snippets:

GET http://127.0.0.1:6808/snippets/<snippet-name>.js
→ 200, snippet source

Export artifacts (conditional on a predictable name while the artifact exists):

GET http://127.0.0.1:6808/export/csv/<doc-name>/<doc-name>.csv
→ 200, exported content of a document the reader has no publish access to

Impact

An anonymous reader (publish mode with auth disabled) or any publish RoleReader can read user-authored template documents that the REST API explicitly withholds from non-administrators, snippet source (JS/CSS), and the contents of the widgets, plugins and emoji directories. Where an export artifact exists under a derivable name, they can additionally retrieve exported content of documents outside their publish scope. Confidentiality-only.

Suggested fix

Apply the same treatment these routes' REST counterparts already receive: for non-administrator roles, enforce publish-access scoping plus IsSensitivePath and the refuseToAccess blocklist on the static routes, mirroring /assets/*. Alternatively, block /templates/, non-public /snippets/, and /export/ for reader roles entirely.

Severity

5.8 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260725122641-34be6c0bb073"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72796"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-04T21:02:22Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "**CVE:** This vulnerability corresponds to [CVE-2026-72796](https://nvd.nist.gov/vuln/detail/CVE-2026-72796).\n\n### Summary\n\nSeveral static-file routes in the server mux (`kernel/server/serve.go`) are registered with `CheckAuth` only and serve directories directly, without the publish-access checks, sensitive-path blocklist, or `refuseToAccess` rules that the REST API applies to the same data. They are therefore reachable by the publish `RoleReader` token and by the anonymous account when `Publish.Auth.Enable` is `false`.\n\nMost notably, `/templates/` serves `data/templates` a directory the REST file API explicitly refuses to serve to non-administrators.\n\n### Details\n\n| Route | Registration | Guard | Exposed to a reader |\n|---|---|---|---|\n| `/templates/*` (line 424) | `Group(\"/templates/\", model.CheckAuth).Static(\"\", data/templates)` | none beyond path cleaning | the templates directory |\n| `/snippets/*` (line 434) | `CheckAuth` | blocks only `conf.json` | any snippet\u0027s JS/CSS content by name |\n| `/widgets/`, `/plugins/`, `/emojis/` (409/414/419) | `Group(CheckAuth).Static(dir)` | none | whole directory trees |\n| `/export/*` (line 320) | `Group(\"/export/\", CheckAuth)` | traversal, sensitive-path and DEK guards: **no publish check** | export artifacts (PDF/HTML/DOCX/CSV) |\n\n**`/templates/` directly contradicts an existing control.** The REST file path runs `refuseToAccess` (`kernel/api/file.go:551-553`), which explicitly returns 403 for `data/templates/` to non-administrators the project has already decided readers must not read templates. The `/templates/` static route serves that same directory to any `RoleReader`, with no `IsSensitivePath` check, no publish-access check, and no `refuseToAccess`. Templates are user-authored Markdown documents containing template/Sprig syntax and are not covered by publish-access controls. `gin`\u0027s `.Static` disables directory listing, so a filename is required but the contradiction with `refuseToAccess` is the defect.\n\n**`/export/` versus `/assets/`.** `/assets/*path` (line 692) correctly gates non-administrators via `CheckAbsPathAccessableByPublishAccess`, plus `IsSensitivePath` and encrypted-asset handling. `/export/` carries traversal, sensitive-path and DEK guards but no publish-access check, so a reader can retrieve export artifacts of arbitrary documents, including private ones. Artifact naming is mixed, some use a random export ID, but code and CSV exports use the document name (`export/code/\u003cname\u003e`, `export/csv/\u003cname\u003e/\u003cname\u003e.csv`), which a reader can derive from `listDocsByPath` titles while the artifact exists. This path is therefore conditional.\n\n**Confirmed correctly gated, for contrast:** `/assets/*` (publish-gated), `/history/*` and `/repo/diff/*` (`CheckAdminRole`), `/debug/pprof/*` (disabled in production builds), `/public/` (intentionally public).\n\nAll four routes above were verified to carry `CheckAuth` only, no `CheckReadonly`, no `CheckAdminRole`.\n\n### Proof of Concept\n\nPrecondition: publish mode enabled (default port 6808), anonymous when `Publish.Auth.Enable` is `false`, otherwise any publish reader account.\n\n**Templates: served despite the REST API refusing them:**\n```\nGET http://127.0.0.1:6808/templates/\u003ctemplate-file\u003e.md\n\u2192 200, template content\n```\nThe equivalent REST request is refused:\n```\nPOST http://127.0.0.1:6808/api/file/getFile\n{\"path\":\"data/templates/\u003ctemplate-file\u003e.md\"}\n\u2192 403 (refuseToAccess)\n```\nThe same reader session obtains the file through the static route.\n\n**Snippets:**\n```\nGET http://127.0.0.1:6808/snippets/\u003csnippet-name\u003e.js\n\u2192 200, snippet source\n```\n\n**Export artifacts (conditional on a predictable name while the artifact exists):**\n```\nGET http://127.0.0.1:6808/export/csv/\u003cdoc-name\u003e/\u003cdoc-name\u003e.csv\n\u2192 200, exported content of a document the reader has no publish access to\n```\n\n### Impact\n\nAn anonymous reader (publish mode with auth disabled) or any publish `RoleReader` can read user-authored template documents that the REST API explicitly withholds from non-administrators, snippet source (JS/CSS), and the contents of the widgets, plugins and emoji directories. Where an export artifact exists under a derivable name, they can additionally retrieve exported content of documents outside their publish scope. Confidentiality-only.\n\n### Suggested fix\n\nApply the same treatment these routes\u0027 REST counterparts already receive: for non-administrator roles, enforce publish-access scoping plus `IsSensitivePath` and the `refuseToAccess` blocklist on the static routes, mirroring `/assets/*`. Alternatively, block `/templates/`, non-public `/snippets/`, and `/export/` for reader roles entirely.",
  "id": "GHSA-fgmr-7w36-9qfq",
  "modified": "2026-09-04T21:02:22Z",
  "published": "2026-09-04T21:02:22Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fgmr-7w36-9qfq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72796"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/34be6c0bb0739d5b8e99ecc0cbfb474abb16230d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-access-control-bypass-via-static-routes"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan: Static-file routes bypass the publish-access controls enforced on the REST API, exposing templates, snippets and export artifacts to anonymous readers"
}

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.

Vulnerability timeline

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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.
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Action not permitted

CVE-2026-72796 (GCVE-0-2026-72796)

FKIE_CVE-2026-72796

GHSA-CM9F-W4H4-7J85

Duplicate Advisory

Original Description

GHSA-FGMR-7W36-9QFQ

Summary

Details

Proof of Concept

Impact

Suggested fix

Tags

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Related by attack behaviour