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SiYuan EUVDEUVD-2026-57460

| CVE-2026-72800 MEDIUM
Missing Authorization (CWE-862)
2026-08-12 VulnCheck GHSA-fxmw-rv85-5hwh
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
4.3 MEDIUM

PR:L assigned because description references authenticated readers despite PR:N in provided vector; impact is confidentiality-only, low severity, no scope change.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/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 - 20:13 vuln.today
Patch available
Aug 12, 2026 - 20:03 EUVD

DescriptionCVE.org

SiYuan versions before v3.7.4 fail to apply publish-access filtering to the getAttributeViewKeysByID endpoint, allowing authenticated readers to retrieve complete database column schemas including descriptions, select vocabularies, and template expressions. Additionally, getBlockDefIDsByRefText and getBlockRelevantIDs endpoints enumerate workspace-wide block IDs without publish scoping, enabling attackers to discover valid block identifiers across publish boundaries and access content from hidden or password-protected documents.

AnalysisAI

Missing authorization controls on three internal API endpoints in SiYuan before v3.7.4 allow callers operating within the publish context to retrieve database column schemas, template expressions, select vocabularies, and workspace-wide block identifiers that were never intended to cross publish access boundaries. The affected endpoints - getAttributeViewKeysByID, getBlockDefIDsByRefText, and getBlockRelevantIDs - perform their operations without consulting publish-scoped permission checks, constituting a CWE-862 (Missing Authorization) flaw. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach SiYuan API over network
Delivery
Query getBlockDefIDsByRefText or getBlockRelevantIDs with arbitrary input
Exploit
Collect workspace-wide block IDs crossing publish boundaries
Execution
Call getAttributeViewKeysByID with harvested IDs
Impact
Extract database schemas and metadata from restricted documents
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the SiYuan instance be network-reachable and that the publish feature be active; instances running in fully air-gapped or localhost-only configurations are not reachable by external attackers. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 vector assigns PR:N (no privileges required), yet the CVE description explicitly references 'authenticated readers' as the threat actor for at least the getAttributeViewKeysByID endpoint - this discrepancy is unresolved in available data and materially affects real-world risk assessment; defenders should confirm the exact authentication requirement per endpoint against the vendor advisory before classifying the exposure. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with network access to an exposed SiYuan publish interface sends standard HTTP GET requests to getBlockDefIDsByRefText or getBlockRelevantIDs with an arbitrary reference text query, receiving workspace-wide block identifiers that span publish restrictions. Using harvested block IDs, the attacker queries getAttributeViewKeysByID to extract database column schemas - including template expressions and option vocabularies - from attribute view blocks in documents that the publish configuration intended to keep private. …
Remediation Upgrade SiYuan to v3.7.4 or later, which introduces publish-access filtering on the affected endpoints; this is the primary and recommended fix as documented in vendor GitHub Security Advisory GHSA-5fhr-f75j-8wr9 at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5fhr-f75j-8wr9. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-57460 vulnerability details – vuln.today
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