CVE-2026-74800
CRITICAL
NVD
CVSS Score
9
Severity
CRITICAL
Published
Aug 17, 2026
Vendor
unknown
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.