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SiYuan CVE-2026-73048

| EUVDEUVD-2026-58654 MEDIUM
Missing Authorization (CWE-862)
2026-08-14 VulnCheck GHSA-p6g3-j3g7-h96w
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-reachable unauthenticated endpoint requiring no user interaction; confidentiality impact limited to block ID metadata with no integrity or availability effect.

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 - 12:35 vuln.today

DescriptionCVE.org

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the getRefIDsByFileAnnotationID endpoint that returns block identifiers citing PDF annotations without publish-access filtering. Attackers can extract block identifiers from restricted documents by supplying annotation identifiers visible in published pages, revealing citation relationships across forbidden and password-protected tiers.

AnalysisAI

SiYuan personal knowledge management software before v3.7.4 exposes block identifiers from restricted and password-protected documents via the unauthenticated getRefIDsByFileAnnotationID API endpoint, which processes annotation-to-block lookups without any publish-access authorization check. Remote unauthenticated attackers who can observe PDF annotation identifiers on published pages can query this endpoint to enumerate citation relationships spanning documents intended to be inaccessible, leaking structural metadata about restricted content. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Access publicly published SiYuan page
Delivery
Harvest embedded PDF annotation identifiers
Exploit
Submit identifiers to getRefIDsByFileAnnotationID unauthenticated
Execution
Receive block IDs from restricted documents
Impact
Map citation topology of protected content
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Vulnerability AssessmentAI

Exploitation The SiYuan instance must be network-accessible and must have at least one publicly published page that contains PDF annotations - annotation identifiers visible in those published pages serve as the required input to the vulnerable endpoint. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 6.9, driven by a vector of AV:N/AC:L/AT:N/PR:N/UI:N, confirms remote exploitability with zero authentication and no complexity barrier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker visits a publicly shared SiYuan page and harvests PDF annotation identifiers that are embedded by design in the published content, then issues unauthenticated HTTP GET requests to the `getRefIDsByFileAnnotationID` endpoint, supplying those annotation IDs as parameters. The API responds with block identifiers drawn from restricted or password-protected documents, allowing the attacker to reconstruct citation relationships and confirm the existence and inter-referencing structure of documents they should never be able to access. …
Remediation Upgrade SiYuan to v3.7.4 or later, which introduces publish-access filtering on the `getRefIDsByFileAnnotationID` endpoint per the vendor advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f3q6-vc7q-m6h7. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-73048 vulnerability details – vuln.today
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