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SiYuan EUVDEUVD-2026-57813

| CVE-2026-73609 MEDIUM
Missing Authorization (CWE-862)
2026-08-13 VulnCheck GHSA-7v6h-j59w-8qfp
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

Network-accessible endpoint requires no authentication or user interaction; only bookmark label metadata is disclosed, yielding low confidentiality and zero integrity or availability impact with unchanged scope.

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 13, 2026 - 13:01 EUVD
Analysis Generated
Aug 13, 2026 - 12:55 vuln.today

DescriptionCVE.org

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the getBookmarkLabels endpoint that returns all bookmark labels in the workspace without publish-access filtering. Anonymous readers and publish-mode readers can obtain the complete bookmark vocabulary across the workspace, disclosing subject matter and organizational information from inaccessible documents.

AnalysisAI

The getBookmarkLabels API endpoint in SiYuan before v3.7.4 exposes all workspace bookmark labels to unauthenticated and publish-mode readers due to missing authorization checks (CWE-862), leaking organizational metadata - topic taxonomy, project labels, and subject-matter vocabulary - from documents the requester cannot otherwise access. Any network-reachable SiYuan instance prior to v3.7.4 is affected regardless of publish-mode configuration, as the endpoint applies no access-control filtering. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-exposed SiYuan HTTP API
Delivery
Send unauthenticated GET to getBookmarkLabels endpoint
Exploit
Receive full workspace bookmark label vocabulary
Execution
Extract organizational subject matter and project taxonomy
Impact
Leverage for reconnaissance or social engineering
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the SiYuan instance is running a version prior to v3.7.4 and its HTTP API server is network-reachable from the attacker (internet-exposed or accessible on the local network). … 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) confirms unauthenticated, zero-complexity network access with no attack prerequisites, representing the most accessible attack posture. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An external attacker discovers a publicly reachable SiYuan instance via passive DNS enumeration or internet scanning, then sends a single unauthenticated HTTP request to the getBookmarkLabels endpoint. The response immediately returns the complete workspace bookmark label list - including internal project names, classification tags, and topic vocabulary from otherwise inaccessible private documents - which the attacker incorporates into a targeted spear-phishing campaign or competitive intelligence effort. …
Remediation Upgrade to SiYuan v3.7.4 or later, which introduces publish-access filtering on the getBookmarkLabels endpoint as confirmed by the vendor security advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-j4ph-9xwf-wcj4. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-57813 vulnerability details – vuln.today
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