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SiYuan CVE-2026-73049

| EUVDEUVD-2026-58618 MEDIUM
Incorrect Authorization (CWE-863)
2026-08-14 VulnCheck GHSA-6xvp-3rfv-g2g2
Information Disclosure 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

Unauthenticated network access with no complexity; confidentiality limited to document metadata (path, title, name) with no integrity or availability impact.

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
Patch available
Aug 14, 2026 - 13:01 EUVD
Analysis Generated
Aug 14, 2026 - 12:21 vuln.today

DescriptionCVE.org

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the getAttributeViewBacklinks endpoint that consults the forbidden access list instead of the visibility list when filtering backlinks. Anonymous readers can supply a publicly visible database row identifier to discover hidden-tier documents that reference it, receiving the database name, row title, and document path of hidden documents.

AnalysisAI

The getAttributeViewBacklinks endpoint in SiYuan before v3.7.4 leaks hidden document metadata to unauthenticated network attackers due to a logic error that applies the wrong access control list during backlink filtering. By supplying a publicly visible database row identifier, anonymous users receive the database name, row title, and full document path of hidden-tier documents that reference that row - bypassing the visibility list entirely. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify network-accessible SiYuan instance
Exploit
Access public database (AttributeView) view to obtain row identifier
Execution
Craft unauthenticated HTTP request to getAttributeViewBacklinks endpoint
Impact
Receive hidden document metadata in API response
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Vulnerability AssessmentAI

Exploitation Exploitation requires the SiYuan instance to be network-accessible from the attacker (AV:N) and the workspace must have at least one document assigned to a hidden visibility tier that is referenced by a row in a database (AttributeView) with at least one publicly visible entry. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) places this at the low-friction end of the exploit spectrum: no authentication, no complexity, and no prerequisites beyond a valid public database row ID. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker discovers a publicly exposed SiYuan instance and, through normal interaction with a shared database view, obtains the identifier of a visible database row. They send a single HTTP request to the getAttributeViewBacklinks endpoint with that row ID; the misconfigured authorization path returns metadata for all hidden documents that reference the row, including their file system paths and titles. …
Remediation Upgrade SiYuan to v3.7.4 or later, which corrects the authorization logic in getAttributeViewBacklinks to consult the visibility list rather than the forbidden access list. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-73049 vulnerability details – vuln.today
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