CVE-2026-87809
Siyuan before v3.8.2 Information Disclosure via Export Preview
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 9, 2026
- Updated
- Sep 18, 2026
- Reserved
- Sep 9, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-8wx4-fvqw-f5f8)vendor-advisory
- VulnCheck Advisory: Siyuan before v3.8.2 Information Disclosure via Export Previewthird-party-advisory
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