Medium severity · published Sep 9, 2026
CVE-2026-87809
Siyuan before v3.8.2 Information Disclosure via Export Preview
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
before 3.8.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87809
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87809
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-preview
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