Origin Validation Error

Summary

The WebSocket upgrader for the `/exec` and `/attach` endpoints uses `CheckOrigin: func(r *http.Request) bool { return true }`, accepting upgrade requests from any origin. Combined with the JWT cookie using `SameSite: Lax`, this enables Cross-Site WebSocket Hijacking (CSWSH) - even when authentication is properly configured. An attacker hosting a page on a same-site origin (e.g., a sibling subdomain, or another service on localhost) can initiate a WebSocket connection to the exec endpoint that carries the victim's valid JWT cookie, gaining interactive shell access in any container the victim is authorized to access. This issue affects Dozzle versions prior to 10.5.2.