{"id":"CVE-2026-116748","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-116748","summary":"Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handle_request() in rpc-server.cc that exposes the X-Transmission-Session-Id anti-CSRF token to any web origin.…","details":"Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handle_request() 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, enabling script-torrent-done execution, download-dir changes, or torrent and data deletion.","published":"2026-10-26T22:16:59.610","modified":"2026-10-26T22:16:59.610","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e","label":"transmission/transmission@c6a1bd2"},"references":[{"type":"WEB","url":"https://github.com/transmission/transmission"},{"type":"WEB","url":"https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560"},{"type":"WEB","url":"https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e"},{"type":"WEB","url":"https://github.com/transmission/transmission/pull/8938"},{"type":"WEB","url":"https://github.com/transmission/transmission/releases/tag/4.1.3"},{"type":"WEB","url":"https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploit"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-10-26T22:16:59.610"}}