CVE-2026-74800 [CRITICAL] – SiYuan before v3.7.4 fails to set Content-Disposition and X-Content-Type-Options headers w

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.