Vulnerability Description
SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
- https://www.vulncheck.com/advisories/siyuan-before-stored-xss-to-rce-via-title-i
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-5rxg-wh59-mg34
FAQ
What is CVE-2026-66396?
CVE-2026-66396 is a vulnerability with a CVSS score of 8.4 (HIGH). SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute in...
How severe is CVE-2026-66396?
CVE-2026-66396 has been rated HIGH with a CVSS base score of 8.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66396?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.