CVE-2026-116748 Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token

Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handlerequest in rpc-server.cc that exposes the X-Transmission-Session-Id anti-CSRF token to any web origin. Malicious web pages can read the token from the 409 handshake response and replay it to issue RPC calls, enablin...