CVE-2026-87809

MEDIUM 6.5

Siyuan before v3.8.2 Information Disclosure via Export Preview

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-639
Vendor	siyuan-note
Product	siyuan
Published	Sep 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

siyuan-note / siyuan

0 < 3.8.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8 vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-preview