EXPOSURES › CVE-2026-74800

▸ RECOMMENDED ACTION  Critical severity — schedule patching of the affected products.

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.