Vulnerability DatabaseCVE-2026-87809
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CVE-2026-87809
Published:September 09, 2026
Updated:September 22, 2026
Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.
Affected Packages
https://github.com/siyuan-note/siyuan.git (GITHUB):
Affected version(s) >=v3.6.0 <v3.8.2
Fix Suggestion:
Update to version v3.8.2
Related Resources (3)
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-preview
https://nvd.nist.gov/vuln/detail/CVE-2026-87809
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639
EPSS
Base Score:
0.21