CVE-2026-74800

Description

SiYuan before v3.7.4 fails to set Content-Disposition and X-Content-Type-Options headers when serving arbitrary file assets, allowing stored cross-site scripting attacks. Authenticated attackers can upload HTML files as assets and execute scripts with full kernel API access when the workspace owner opens the asset link.

CVSS Vector

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mjf3-jwmf-r6wf
• https://www.vulncheck.com/advisories/siyuan-before-stored-xss-via-assets-endpoint