{"id":"CVE-2026-116748","aliases":[],"title":"Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","titleSource":"VulnCheck","descriptionSource":"VulnCheck","products":[{"vendor":"transmission","name":"transmission","platforms":[],"versions":[{"version":"4.0.0","status":"affected","lessThan":"4.1.3","versionType":"semver"}],"defaultStatus":"unaffected","source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2026-116748"}],"remediation":[],"description":"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deletion.","severity":"high","score":8.7,"published":"2026-10-26T21:52:45.799Z","modified":"2026-10-26T21:52:45.799Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://github.com/transmission/transmission/pull/8938","https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e","https://github.com/transmission/transmission","https://github.com/transmission/transmission/releases/tag/4.1.3","https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560","https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploit","https://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token"],"sources":[{"name":"CVE","id":"CVE-2026-116748","modified":"2026-10-26T21:52:45.799Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-116748"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T14:40:33.551Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}