CVE-2026-116171 SiYuan - Broken Access Control

SiYuan 3.5.4 before 3.8.7 on Windows contains a sensitive-path denylist bypass caused by Windows extended-length prefix (\\?\) surviving filepath.Clean in IsSensitivePath, letting authenticated API callers copy sensitive workspace config files including API tokens and TLS private keys to assets served to unauthenticated clients, exploit requires authenticated API access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
25 October 2026
Updated
26 October 2026
Weakness
CWE-22

Vendor fix

Update to version 3.8.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs