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SiYuan CVE-2026-82652

| EUVDEUVD-2026-68238 MEDIUM
Exposure of Resource to Wrong Sphere (CWE-668)
2026-08-30 VulnCheck GHSA-q9wp-phq7-jv7c
Information Disclosure Siyuan Siyuan Note
6.9
CVSS 4.0 · Vendor: VulnCheck
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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:N/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 publish endpoint with no authentication required; impact is limited to partial confidentiality loss of invisible-tier content only, 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:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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

Lifecycle Timeline

3
CVE Published
Aug 31, 2026 - 10:50 cve.org
MEDIUM 6.9
Patch available
Aug 30, 2026 - 16:01 EUVD
Analysis Generated
Aug 30, 2026 - 15:07 vuln.today

DescriptionCVE.org

SiYuan before v3.8.1 fails to filter invisible-tier content from SQL embed blocks, attribute-view keys, and attribute-view backlinks in publish mode. Anonymous readers can enumerate invisible content through these three listing mechanisms despite admin configuration marking content unlisted.

AnalysisAI

SiYuan's publish mode before v3.8.1 leaks invisible-tier content to unauthenticated readers through three unguarded rendering pathways: SQL embed blocks, attribute-view keys, and attribute-view backlinks. Administrators who mark notes as invisible to control what anonymous visitors see receive no protection - those same visitors can enumerate the hidden content by exploiting any of the three listing mechanisms. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Exploit
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Execution
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Impact
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Vulnerability AssessmentAI

Exploitation Exploitation requires two prerequisites: SiYuan must be running in publish mode (this is not the default configuration - it must be explicitly enabled by the operator), and at least one piece of content must be marked as invisible tier. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N) accurately characterizes the risk profile: unauthenticated network access with a bounded confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade SiYuan to v3.8.1 or later; this release patches all three affected rendering pathways according to the vendor advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-2pgf-jv7c-q7rx. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-82652 vulnerability details – vuln.today
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