Vulnerability Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed with raw special characters. An attacker can embed a malicious IAL value inside a .sy document, package it as a .sy.zip, and have the victim import it through the normal Import -> SiYuan .sy.zip workflow. Once the note is opened, the malicious attribute breaks out of its original HTML context and injects an event handler, resulting in stored XSS. In the Electron desktop client, this XSS reaches remote code execution because injected JavaScript runs with access to Node/Electron APIs. This issue has been patched in version 3.6.2.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| B3Log | Siyuan | < 3.6.2 |
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/issues/17246Issue Tracking
- https://github.com/siyuan-note/siyuan/releases/tag/v3.6.2Release Notes
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fgExploitVendor Advisory
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-ff66-236v-p4fgExploitVendor Advisory
FAQ
What is CVE-2026-34585?
CVE-2026-34585 is a vulnerability with a CVSS score of 8.6 (HIGH). SiYuan is a personal knowledge management system. Prior to version 3.6.2, a vulnerability allows crafted block attribute values to bypass server-side attribute escaping when an HTML entity is mixed wi...
How severe is CVE-2026-34585?
CVE-2026-34585 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-34585?
Check the references section above for vendor advisories and patch information. Affected products include: B3Log Siyuan.