Vulnerability-Lookup

CVE-2026-68584 (GCVE-0-2026-68584)

Vulnerability from cvelistv5 – Published: 2026-08-03 13:20 – Updated: 2026-08-14 16:51

Title

SiYuan before v3.7.3 Authentication Bypass via Content Endpoints

Summary

SiYuan versions before v3.7.3 contain an authentication bypass vulnerability in publish mode where content-returning endpoints getHeadingChildrenDOM, getHeading*Transaction, and getBacklinkDoc perform no password check despite protecting the primary getDoc endpoint. Anonymous attackers can retrieve full content of password-protected documents by obtaining internal block IDs from reader-accessible endpoints and calling unprotected content endpoints to bypass the password gate.

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: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 20:02 UTC

CWE

CWE-288 - Authentication Bypass Using an Alternate Path or Channel

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 , < 3.7.3 (semver) Unaffected: 3.7.3 (semver) cpe:2.3:a:b3log:siyuan::::::::

Date Public

2026-07-21 00:00

Credits

Shirshakhtml

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-68584

Vulnerability from fkie_nvd - Published: 2026-08-03 14:16 - Updated: 2026-08-26 17:05

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-7j72-f6wg-cxw6
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-endpoints

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-03T20:02:02.277227Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-03T14:16:27.943",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j72-f6wg-cxw6"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-endpoints"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-288"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-7J72-F6WG-CXW6

Vulnerability from github – Published: 2026-09-03 21:22 – Updated: 2026-09-08 18:03

Summary

SiYuan: Anonymous publish-password authentication bypass via getHeadingChildrenDOM / getHeading*Transaction / getBacklinkDoc (publish mode)

Details

CVE: This vulnerability corresponds to CVE-2026-68584.

Summary

SiYuan's publish mode defines a "protected" access level: a document that is publicly listed but requires a password to read (per the product's own UI help text, protected = "Publicly visible, requires password to access"). The password is enforced on the primary content path (getDoc, via FilterContentByPublishAccess).

Several other content-returning endpoints getHeadingChildrenDOM, getHeadingDeleteTransaction/getHeadingLevelTransaction/ getHeadingInsertTransaction, and getBacklinkDoc/getBackmentionDoc return rendered block DOM with no password check at all. Combined with reader-reachable endpoints that leak a protected document's internal block IDs, an anonymous reader can retrieve the full body of a password-protected document without the password. This has been reproduced end-to-end on a live instance.

Details

The password control and where it is enforced. Publish access has five levels encoded in visible/password/disable: public, protected (password), hidden, private (password), forbidden. getDoc correctly enforces the password for protected/private documents via FilterContentByPublishAccess. The bug is that other content endpoints do not.

Content endpoints with no password check (all CheckAuth-only): - getHeadingChildrenDOM returns rendered DOM of a heading subtree. - getHeadingDeleteTransaction/getHeadingLevelTransaction/getHeadingInsertTransaction return rendered heading DOM in the computed transaction payload (no mutation occurs on this path). - getBacklinkDoc/getBackmentionDoc return rendered DOM of referencing blocks.

None of these invokes the publish-password check that getDoc applies. Each converts a block ID into full rendered content regardless of the containing document's protected/password status.

The ID-leak that removes the precondition. A protected document is, by design, publicly listed (listDocsByPath filters on visible, and protected documents are visible), so an anonymous reader obtains the document's root ID. The document's internal block/heading IDs are then obtainable from reader-reachable endpoints notably the searchEmbedBlock endpoint (reported separately), whose post-query filter FilterEmbedBlocksByPublishAccess replaces the content string but retains the block ID. So the "filtered" search still yields the protected document's internal heading IDs. (Other reader-reachable endpoints also leak block IDs, the vulnerability does not depend on any single ID source.)

The chain, reproduced on a live instance. Against a real protected document (password set), an anonymous reader on port 6808 with no token and no password:

getDoc(protectedDoc) → returns the password-required placeholder (correctly blocked).
searchEmbedBlock with a statement selecting heading blocks for the document's root ID → returns the heading IDs (content filtered, IDs retained).
getHeadingChildrenDOM(headingId) → returns the full rendered body of the protected document, including its protected content.

The password gate that step 1 enforces is entirely bypassed by step 3.

Proof of Concept

Reproduced on a local instance (SiYuan running locally, publish mode enabled on port 6808, publish Basic Auth disabled). Setup: a document marked "protected" with password, whose body contains the unique marker TOP_SECRET_CRITICAL_123.

1. Confirm the password gate blocks the primary path (anonymous, port 6808):

POST http://127.0.0.1:6808/api/filetree/getDoc
{"id":"PROTECTED_DOC"}

Returns the password-required placeholder correctly blocked.

2. Leak the protected document's heading ID (anonymous, port 6808):

POST http://127.0.0.1:6808/api/search/searchEmbedBlock
{"stmt":"SELECT * FROM blocks WHERE root_id='PROTECTED_DOC' AND type='h'"}

Returns heading blocks with their IDs; the content field is filtered but the block ID is retained.

3. Retrieve the protected content without the password (anonymous, port 6808):

POST http://127.0.0.1:6808/api/block/getHeadingChildrenDOM
{"id":"HEADING_ID"}

Returns HTTP 200 with the rendered body of the protected document, including TOP_SECRET_CRITICAL_123 retrieved with no token and no password.

getHeadingDeleteTransaction/getHeadingLevelTransaction/getHeadingInsertTransaction and getBacklinkDoc/ getBackmentionDoc provide the same password-free content retrieval given a block ID from the protected document.

Impact

An anonymous reader (publish mode with auth disabled) or any publish RoleReader can read the full content of a password-protected published document without the password, defeating the "protected" access control the product documents as a password gate. The core defect is that these content-returning endpoints perform no publish-password check; the ID-leak endpoints (multiple sources) supply the block IDs that make the bypass reachable anonymously and untargeted. Impact is confidentiality-only (content disclosure); no modification occurs on these paths. Encrypted notebooks are out of scope.

Suggested fix

Apply the publish-password/publish-access check that getDoc uses (FilterContentByPublishAccess/IsReadOnlyRoleContext plus the password-cookie check) to every content-returning endpoint: getHeadingChildrenDOM, the three getHeading*Transaction handlers, and getBacklinkDoc/getBackmentionDoc. Separately, FilterEmbedBlocksByPublishAccess should omit filtered blocks entirely rather than blanking the content while retaining the ID, so that filtered results cannot be used to enumerate a protected document's internal block IDs. The durable fix is to enforce the publish boundary in the shared render/DOM path rather than per-handler, since any content endpoint that omits the check reintroduces this class.

Severity

8.6 (High)


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

Show details on source website

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260721020826-2d069dce84a2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-68584"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-03T21:22:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "**CVE:** This vulnerability corresponds to [CVE-2026-68584](https://nvd.nist.gov/vuln/detail/CVE-2026-68584).\n\n### Summary\n\nSiYuan\u0027s publish mode defines a \"protected\" access level: a document that is publicly listed but requires a password to read (per the product\u0027s own UI help text, protected = \"Publicly visible, requires password to access\"). The password is enforced on the primary content path (`getDoc`, via `FilterContentByPublishAccess`).\n\nSeveral other content-returning endpoints `getHeadingChildrenDOM`, `getHeadingDeleteTransaction`/`getHeadingLevelTransaction`/ `getHeadingInsertTransaction`, and `getBacklinkDoc`/`getBackmentionDoc` return rendered block DOM with **no password check at all**. Combined with reader-reachable endpoints that leak a protected document\u0027s internal block IDs, an anonymous reader can retrieve the full body of a password-protected document without the password. This has been reproduced end-to-end on a live instance.\n\n### Details\n\n**The password control and where it is enforced.** Publish access has five levels encoded in `visible`/`password`/`disable`: public, protected (password), hidden, private (password), forbidden. `getDoc` correctly enforces the password for protected/private documents via `FilterContentByPublishAccess`. The bug is that other content endpoints do not.\n\n**Content endpoints with no password check (all `CheckAuth`-only):**\n- `getHeadingChildrenDOM` returns rendered DOM of a heading subtree.\n- `getHeadingDeleteTransaction`/`getHeadingLevelTransaction`/`getHeadingInsertTransaction` return rendered heading DOM in the computed transaction payload (no mutation occurs on this path).\n- `getBacklinkDoc`/`getBackmentionDoc` return rendered DOM of referencing blocks.\n\nNone of these invokes the publish-password check that `getDoc` applies. Each converts a block ID into full rendered content regardless of the containing document\u0027s protected/password status.\n\n**The ID-leak that removes the precondition.** A protected document is, by design, publicly listed (`listDocsByPath` filters on `visible`, and protected documents are visible), so an anonymous reader obtains the document\u0027s root ID. The document\u0027s internal block/heading IDs are then obtainable from reader-reachable endpoints notably the `searchEmbedBlock` endpoint (reported separately), whose post-query filter `FilterEmbedBlocksByPublishAccess` **replaces the content string but retains the block ID**. So the \"filtered\" search still yields the protected document\u0027s internal heading IDs. (Other reader-reachable endpoints also leak block IDs, the vulnerability does not depend on any single ID source.)\n\n**The chain, reproduced on a live instance.** Against a real protected document (password set), an anonymous reader on port 6808 with no token and no password:\n\n1. `getDoc(protectedDoc)` \u2192 returns the password-required placeholder (correctly blocked).\n2. `searchEmbedBlock` with a statement selecting heading blocks for the document\u0027s root ID \u2192 returns the heading IDs (content filtered, IDs retained).\n3. `getHeadingChildrenDOM(headingId)` \u2192 returns the full rendered body of the protected document, including its protected content.\n\nThe password gate that step 1 enforces is entirely bypassed by step 3.\n\n### Proof of Concept\n\nReproduced on a local instance (SiYuan running locally, publish mode enabled on port 6808, publish Basic Auth disabled). Setup: a document marked \"protected\" with password, whose body contains the unique marker `TOP_SECRET_CRITICAL_123`.\n\n**1. Confirm the password gate blocks the primary path (anonymous, port 6808):**\n```\nPOST http://127.0.0.1:6808/api/filetree/getDoc\n{\"id\":\"PROTECTED_DOC\"}\n```\nReturns the password-required placeholder correctly blocked.\n\n**2. Leak the protected document\u0027s heading ID (anonymous, port 6808):**\n```\nPOST http://127.0.0.1:6808/api/search/searchEmbedBlock\n{\"stmt\":\"SELECT * FROM blocks WHERE root_id=\u0027PROTECTED_DOC\u0027 AND type=\u0027h\u0027\"}\n```\nReturns heading blocks with their IDs; the content field is filtered but the block ID is retained.\n\n**3. Retrieve the protected content without the password (anonymous, port 6808):**\n```\nPOST http://127.0.0.1:6808/api/block/getHeadingChildrenDOM\n{\"id\":\"HEADING_ID\"}\n```\nReturns HTTP 200 with the rendered body of the protected document, including `TOP_SECRET_CRITICAL_123` retrieved with no token and no password.\n\n`getHeadingDeleteTransaction`/`getHeadingLevelTransaction`/`getHeadingInsertTransaction` and `getBacklinkDoc`/ `getBackmentionDoc` provide the same password-free content retrieval given a block ID from the protected document.\n\n### Impact\n\nAn anonymous reader (publish mode with auth disabled) or any publish `RoleReader` can read the full content of a password-protected published document without the password, defeating the \"protected\" access control the product documents as a password gate. The core defect is that these content-returning endpoints perform no publish-password check; the ID-leak endpoints (multiple sources) supply the block IDs that make the bypass reachable anonymously and untargeted. Impact is confidentiality-only (content disclosure); no modification occurs on these paths. Encrypted notebooks are out of scope.\n\n### Suggested fix\n\nApply the publish-password/publish-access check that `getDoc` uses (`FilterContentByPublishAccess`/`IsReadOnlyRoleContext` plus the password-cookie check) to every content-returning endpoint: `getHeadingChildrenDOM`, the three `getHeading*Transaction` handlers, and `getBacklinkDoc`/`getBackmentionDoc`. Separately, `FilterEmbedBlocksByPublishAccess` should omit filtered blocks entirely rather than blanking the content while retaining the ID, so that filtered results cannot be used to enumerate a protected document\u0027s internal block IDs. The durable fix is to enforce the publish boundary in the shared render/DOM path rather than per-handler, since any content endpoint that omits the check reintroduces this class.",
  "id": "GHSA-7j72-f6wg-cxw6",
  "modified": "2026-09-08T18:03:33Z",
  "published": "2026-09-03T21:22:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j72-f6wg-cxw6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68584"
    },
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/commit/2d069dce84a25c959ef0093c72c98e05778ef218"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/siyuan-note/siyuan"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-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: Anonymous publish-password authentication bypass via getHeadingChildrenDOM / getHeading*Transaction / getBacklinkDoc (publish mode)"
}

GHSA-G64V-QQPG-V37H

Vulnerability from github – Published: 2026-08-03 15:32 – Updated: 2026-09-08 18:03

Withdrawn 2026-09-08

Summary

Duplicate Advisory: Anonymous publish-password authentication bypass via getHeadingChildrenDOM / getHeading*Transaction / getBacklinkDoc (publish mode)

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-7j72-f6wg-cxw6. 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

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 3.7.3"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/siyuan-note/siyuan/kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-288"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-08T18:03:25Z",
    "nvd_published_at": "2026-08-03T14:16:27Z",
    "severity": "CRITICAL"
  },
  "details": "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of\u00a0GHSA-7j72-f6wg-cxw6. This link is maintained to preserve external references.\n\n## Original Description\nSiYuan versions before v3.7.3 contain an authentication bypass vulnerability in publish mode where content-returning endpoints getHeadingChildrenDOM, getHeading*Transaction, and getBacklinkDoc perform no password check despite protecting the primary getDoc endpoint. Anonymous attackers can retrieve full content of password-protected documents by obtaining internal block IDs from reader-accessible endpoints and calling unprotected content endpoints to bypass the password gate.",
  "id": "GHSA-g64v-qqpg-v37h",
  "modified": "2026-09-08T18:03:25Z",
  "published": "2026-08-03T15:32:47Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7j72-f6wg-cxw6"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68584"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/siyuan-before-authentication-bypass-via-content-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: Anonymous publish-password authentication bypass via getHeadingChildrenDOM / getHeading*Transaction / getBacklinkDoc (publish mode)",
  "withdrawn": "2026-09-08T18:03:25Z"
}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-68584 (GCVE-0-2026-68584)

FKIE_CVE-2026-68584

GHSA-7J72-F6WG-CXW6

Summary

Details

Proof of Concept

Impact

Suggested fix

GHSA-G64V-QQPG-V37H

Duplicate Advisory

Original Description

Tags

Sightings

Nomenclature

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