Vulnerability Description
SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/siyuan-note/siyuan
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
- https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading
FAQ
What is CVE-2026-93923?
CVE-2026-93923 is a vulnerability with a CVSS score of 8.8 (HIGH). SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call admini...
How severe is CVE-2026-93923?
CVE-2026-93923 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93923?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.