Vulnerability-Lookup

CVE-2026-72804 (GCVE-0-2026-72804)

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

Title

SiYuan before v3.7.4 Authentication Bypass via Graph Endpoints

Summary

SiYuan versions before v3.7.4 fail to validate publish-password tier in getGraph and getLocalGraph endpoints, allowing anonymous readers to retrieve block-level content of password-protected documents. Attackers can call these endpoints without supplying a password to read protected document content and the complete reference topology.

Severity

9.2 (Critical)


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

8.6 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-12 19:48 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

VulnCheck mitre root

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

2026-07-24 00:00

Credits

Shirshakhtml

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-72804

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

Severity

8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vpjw-wf5h-cgpq
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-graph-endpoints

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:golang/github.com/siyuan-note/siyuan/kernel",
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              "versionType": "semver"
            },
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              "versionType": "semver"
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    }
  ],
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  "lastModified": "2026-08-26T16:56:50.830",
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}

GHSA-V598-7627-G9FX

Vulnerability from github – Published: 2026-08-12 21:31 – Updated: 2026-09-03 22:52

Withdrawn 2026-09-03

Summary

Duplicate Advisory: Graph endpoints omit the publish-password tier: anonymous readers receive block-level content of password-protected documents

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-vpjw-wf5h-cgpq. This link is maintained to preserve external references.

Original Description

Severity

8.6 (High)


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

9.2 (Critical)


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

Show details on source website

JSON

To clipboard

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        "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-200"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-03T22:52:45Z",
    "nvd_published_at": "2026-08-12T20:17:52Z",
    "severity": "CRITICAL"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-vpjw-wf5h-cgpq. This link is maintained to preserve external references.\n\n## Original Description\nSiYuan versions before v3.7.4 fail to validate publish-password tier in getGraph and getLocalGraph endpoints, allowing anonymous readers to retrieve block-level content of password-protected documents. Attackers can call these endpoints without supplying a password to read protected document content and the complete reference topology.",
  "id": "GHSA-v598-7627-g9fx",
  "modified": "2026-09-03T22:52:45Z",
  "published": "2026-08-12T21:31:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vpjw-wf5h-cgpq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72804"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-graph-endpoints"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/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: Graph endpoints omit the publish-password tier: anonymous readers receive block-level content of password-protected documents",
  "withdrawn": "2026-09-03T22:52:45Z"
}

GHSA-VPJW-WF5H-CGPQ

Vulnerability from github – Published: 2026-09-03 22:52 – Updated: 2026-09-03 22:52

Summary

SiYuan: Graph endpoints omit the publish-password tier: anonymous readers receive block-level content of password-protected documents

Details

CVE: This vulnerability corresponds to CVE-2026-72804.

Summary

getGraph and getLocalGraph filter reader sessions against the visibility tier only and never check the publish password. Password-protected documents are Visible = true, so their graph nodes survive the filter and graph nodes are block-level and carry the block's actual content. An anonymous reader who has never supplied a document's password can therefore retrieve that document's per-block content and its reference/backlink topology. Both endpoints are CheckAuth-only, so they are reachable by the publish RoleReader token and by the anonymous account when Publish.Auth.Enable is false.

Details

Both handlers filter with the invisible-tier set only:

publishIgnore := model.GetInvisiblePublishAccess(publishAccess)   // Visible tier ONLY
nodes, links = model.FilterGraphByPublishIgnore(publishIgnore, nodes, links)

FilterGraphByPublishIgnore (kernel/model/publish_access.go:849) drops a node only when !CheckPathAccessableByPublishIgnore(node.Box, node.Path, publishIgnore). There is no password evaluation anywhere in the graph code grepping graph.go for CheckPublishAuthCookie or password returns nothing.

Because password-protected documents are Visible = true, their nodes pass the filter unchanged.

The nodes carry content, not just titles. genTreeNodes emits one node per block, and nodeTitleLabel sets node.Title = node.Label = block.Content (kernel/model/graph.go:673-678). So each surviving node exposes the block's text.

This is materially broader than the by-design listing behaviour: listDocsByPath intentionally exposes protected document titles (protected means "publicly visible, password required to access"), but the graph endpoints expose per-block content and the full link/reference topology, which listing never does.

Verified at origin/master: FilterGraphByPublishIgnore contains only the CheckPathAccessableByPublishIgnore call; graph.go contains no password check; both routes are registered CheckAuth without CheckAdminRole.

Proof of Concept

Precondition: publish mode enabled (default port 6808); anonymous when Publish.Auth.Enable is false, otherwise any publish reader account. A document is marked protected (visible, password set) and contains blocks with distinctive content. No password is supplied in any request below.

Targeted: one protected document's content and reference structure:

POST http://127.0.0.1:6808/api/graph/getLocalGraph
{"id":"<PROTECTED_DOC_ID>"}

Returns nodes whose Title/Label contain the protected document's per-block content, plus its links/backlinks.

Workspace-wide: every protected document:

POST http://127.0.0.1:6808/api/graph/getGraph
{}

Returns block-level nodes for every protected document in the workspace, together with the complete link graph.

Control: requesting the same document through the normal content path returns the password placeholder confirming the password gate is enforced elsewhere and omitted here.

Impact

An anonymous reader (publish mode with auth disabled) or any publish RoleReader can read the block-level content of every password-protected document in the workspace, plus the full reference/backlink topology, without ever supplying a password. This defeats the publish-password control for the graph subsystem. Confidentiality-only, no modification.

Suggested fix

Extend the graph filter to evaluate the password tier in addition to visibility: in FilterGraphByPublishIgnore, drop a node unless the document's publish password is unset or the caller presents a valid publish-auth cookie for it (password == "" || CheckPublishAuthCookie(...)), matching the sibling filters that enforce both tiers. Consider also excluding block content from node Title/Label for reader sessions, so the graph conveys structure without document text.

Severity

8.6 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260724091654-82e9ded423e4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-72804"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-03T22:52:58Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "**CVE:** This vulnerability corresponds to [CVE-2026-72804](https://nvd.nist.gov/vuln/detail/CVE-2026-72804).\n\n### Summary\n\n`getGraph` and `getLocalGraph` filter reader sessions against the *visibility* tier only and never check the publish password. Password-protected documents are `Visible = true`, so their graph nodes survive the filter and graph nodes are block-level and carry the block\u0027s actual content. An anonymous reader who has never supplied a document\u0027s password can therefore retrieve that document\u0027s per-block content and its reference/backlink topology. Both endpoints are `CheckAuth`-only, so they are reachable by the publish `RoleReader` token and by the anonymous account when `Publish.Auth.Enable` is `false`.\n\n### Details\n\nBoth handlers filter with the invisible-tier set only:\n\n```go\npublishIgnore := model.GetInvisiblePublishAccess(publishAccess)   // Visible tier ONLY\nnodes, links = model.FilterGraphByPublishIgnore(publishIgnore, nodes, links)\n```\n\n`FilterGraphByPublishIgnore` (`kernel/model/publish_access.go:849`) drops a node only when `!CheckPathAccessableByPublishIgnore(node.Box, node.Path, publishIgnore)`. There is no password evaluation anywhere in the graph code grepping `graph.go` for `CheckPublishAuthCookie` or `password` returns nothing.\n\nBecause password-protected documents are `Visible = true`, their nodes pass the filter unchanged.\n\n**The nodes carry content, not just titles.** `genTreeNodes` emits one node per block, and `nodeTitleLabel` sets `node.Title = node.Label = block.Content` (`kernel/model/graph.go:673-678`). So each surviving node exposes the block\u0027s text.\n\nThis is materially broader than the by-design listing behaviour: `listDocsByPath` intentionally exposes protected document *titles* (protected means \"publicly visible, password required to access\"), but the graph endpoints expose per-block *content* and the full link/reference topology, which listing never does.\n\nVerified at `origin/master`: `FilterGraphByPublishIgnore` contains only the `CheckPathAccessableByPublishIgnore` call; `graph.go` contains no password check; both routes are registered `CheckAuth` without `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. A document is marked **protected** (visible, password set) and contains blocks with distinctive content. No password is supplied in any request below.\n\n**Targeted: one protected document\u0027s content and reference structure:**\n```\nPOST http://127.0.0.1:6808/api/graph/getLocalGraph\n{\"id\":\"\u003cPROTECTED_DOC_ID\u003e\"}\n```\nReturns nodes whose `Title`/`Label` contain the protected document\u0027s per-block content, plus its links/backlinks.\n\n**Workspace-wide: every protected document:**\n```\nPOST http://127.0.0.1:6808/api/graph/getGraph\n{}\n```\nReturns block-level nodes for every protected document in the workspace, together with the complete link graph.\n\n**Control:** requesting the same document through the normal content path returns the password placeholder confirming the password gate is enforced elsewhere and omitted here.\n\n### Impact\n\nAn anonymous reader (publish mode with auth disabled) or any publish `RoleReader` can read the block-level content of every password-protected document in the workspace, plus the full reference/backlink topology, without ever supplying a password. This defeats the publish-password control for the graph subsystem. Confidentiality-only, no modification.\n\n### Suggested fix\n\nExtend the graph filter to evaluate the password tier in addition to visibility: in `FilterGraphByPublishIgnore`, drop a node unless the document\u0027s publish password is unset or the caller presents a valid publish-auth cookie for it (`password == \"\" || CheckPublishAuthCookie(...)`), matching the sibling filters that enforce both tiers. Consider also excluding block content from node `Title`/`Label` for reader sessions, so the graph conveys structure without document text.",
  "id": "GHSA-vpjw-wf5h-cgpq",
  "modified": "2026-09-03T22:52:58Z",
  "published": "2026-09-03T22:52:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vpjw-wf5h-cgpq"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72804"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/82e9ded423e45eabcc96010abd30c0f96bfe0323"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-graph-endpoints"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "SiYuan: Graph endpoints omit the publish-password tier: anonymous readers receive block-level content of password-protected documents"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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Action not permitted

CVE-2026-72804 (GCVE-0-2026-72804)

FKIE_CVE-2026-72804

GHSA-V598-7627-G9FX

Duplicate Advisory

Original Description

GHSA-VPJW-WF5H-CGPQ

Summary

Details

Proof of Concept

Impact

Suggested fix

Tags

Sightings

Nomenclature

Related by attack behaviour