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SiYuan CVE-2026-72805

| EUVDEUVD-2026-57465 MEDIUM
Missing Authorization (CWE-862)
2026-08-12 VulnCheck GHSA-89hf-xcx5-r9r6
Authentication Bypass Siyuan
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
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/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
vuln.today AI
5.3 MEDIUM

Network-accessible unauthenticated endpoints require no interaction; only low confidentiality impact (metadata/snippets), no integrity or availability impact, no scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 12, 2026 - 20:14 vuln.today
Patch available
Aug 12, 2026 - 20:03 EUVD

DescriptionCVE.org

SiYuan versions before v3.7.4 fail to enforce publish-access checks on getBlockBreadcrumb, getRefText, and getBlockTreeInfos endpoints, allowing disclosure of protected document content and metadata. Anonymous readers or publish RoleReader accounts can retrieve document titles, ancestor block content snippets, reference text, and path metadata for publish-forbidden or password-protected documents by supplying block IDs.

AnalysisAI

Unauthorized information disclosure in SiYuan exposes protected document metadata and content snippets via three unenforced API endpoints - getBlockBreadcrumb, getRefText, and getBlockTreeInfos - in all versions before v3.7.4. Unauthenticated network actors or low-privilege RoleReader accounts can bypass publish-access controls on documents explicitly marked as publish-forbidden or password-protected, retrieving titles, ancestor block content snippets, reference text, and path metadata by supplying block IDs. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify network-exposed SiYuan API instance
Exploit
Enumerate or guess valid block IDs
Execution
Send unauthenticated requests to getBlockBreadcrumb/getRefText/getBlockTreeInfos
Impact
Receive protected document titles, content snippets, and path metadata
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the SiYuan instance has the publish feature enabled and contains at least one document configured as publish-forbidden or password-protected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 6.9 with vector AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N accurately captures the key risk profile: network-accessible, no authentication, no complexity barrier, with low confidentiality impact to both the vulnerable and subsequent systems. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to a SiYuan instance sends unauthenticated HTTP requests to the getBlockBreadcrumb, getRefText, or getBlockTreeInfos API endpoints, supplying block IDs that may be guessed, enumerated, or previously observed. The server returns document titles, breadcrumb path metadata, ancestor block content snippets, and reference text for documents whose owners configured them as publish-forbidden or password-protected. …
Remediation Upgrade SiYuan to v3.7.4 or later; this is the primary and recommended fix, as confirmed by the vendor GitHub Security Advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-67x2-mq63-v9vm. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-72805 vulnerability details – vuln.today
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