CVE-2026-74800

SiYuan before v3.7.4 serves uploaded HTML files without Content-Disposition or X-Content-Type-Options headers, enabling authenticated attackers to inject stored XSS that runs with full kernel API access when the workspace owner clicks the asset link; upgrade to v3.7.4 or later. No active exploita...

EUVD-2026-60083

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 own...

PT-2026-76599

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 own...

CVE-2026-74800: Improper Neutralization of Input During Web Page Generation

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 own...

📄 SiYuan 3.7.1 Authentication Bypass / Arbitrary File Write

A proof of concept exploit for a SiYuan version 3.7.1 authentication bypass arbitrary file read and write vulnerability. SiYuan kernel versions 3.7.0 through 3.7.1 contain a missing authorization vulnerability in the Publish reverse proxy where anonymous RoleReader requests are permitted to acces...