Medium severity6.5NVD Advisory· Published Sep 9, 2026· Updated Sep 18, 2026

CVE-2026-87809

Description

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 products

Siyuan Note/Siyuaninferred2 versions
<3.8.2+ 1 more
- (no CPE)range: <3.8.2
- (no CPE)range: <3.8.2

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8nvd
www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-previewnvd

News mentions

Siyuan Note: Ten Vulnerabilities Including Code Execution and SQLi Disclosed Together
Vypr Intelligence · Sep 9, 2026

cvss	0.423
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000