CVE-2026-93923

Summary

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.

Affected Software

Weaknesses

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
• https://github.com/siyuan-note/siyuan
• https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76
• 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://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute

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