Vulnerability Description
SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not sanitize uploaded SVG files. If a user uploads and views a malicious SVG file (e.g., imported from an untrusted source), arbitrary JavaScript code is executed in the context of their authenticated session. This vulnerability is fixed in 3.5.4-dev2.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| B3Log | Siyuan | < 3.5.4 |
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/commit/11115da3d0de950593ee4ce375cf7f90184Patch
- https://github.com/siyuan-note/siyuan/issues/16844Issue TrackingPatch
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pcjq-j3mq-jv5jExploitVendor AdvisoryPatch
FAQ
What is CVE-2026-23645?
CVE-2026-23645 is a vulnerability with a CVSS score of 6.1 (MEDIUM). SiYuan is self-hosted, open source personal knowledge management software. Prior to 3.5.4-dev2, a Stored Cross-Site Scripting (XSS) vulnerability exists in SiYuan Note. The application does not saniti...
How severe is CVE-2026-23645?
CVE-2026-23645 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23645?
Check the references section above for vendor advisories and patch information. Affected products include: B3Log Siyuan.