{"id":"CVE-2026-116748","aliases":["DEBIAN-CVE-2026-116748","EUVD-2026-110496","GHSA-jw4h-7968-5hj9","UBUNTU-CVE-2026-116748"],"status":"published","title":"Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","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":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.01246,"percentile":0.69722,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-942"],"published":"2026-10-26T21:52:45Z","modified":"2026-11-11T02:48:43Z","exploits":[{"source":"nuclei","id":"CVE-2026-116748","title":"Transmission 4.0.0-4.1.2 - Permissive CORS Exposes RPC Session ID","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-116748.yaml"}],"fixes":[{"ecosystem":"Debian:14","package":"transmission","fixed_in":["4.1.3+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.00-2.1","3.00-2.1+deb12u1","4.0.1-1","4.0.2-1","4.0.5-1","4.0.5-2","4.0.5-3","4.0.6+dfsg-1","4.0.6+dfsg-2","4.0.6+dfsg-3","4.1.0+dfsg-1","4.1.0+dfsg-1~bpo13+1","4.1.0~beta1+dfsg-1","4.1.0~beta2+dfsg-1","4.1.0~beta2+dfsg-2","4.1.0~beta2+dfsg-3","4.1.0~beta2+dfsg-4","4.1.0~beta2+dfsg-5","4.1.0~beta3+dfsg-1","4.1.0~beta4+dfsg-1","4.1.0~beta5+dfsg-1","4.1.1+dfsg-1","4.1.1+dfsg-1~bpo13+1","4.1.2+dfsg-1","4.1.2+dfsg-1~bpo13+1","4.1.3+dfsg-1","4.1.3+dfsg-1~bpo13+1","4.1.4+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0+dfsg-1","4.1.0+dfsg-1~bpo13+1","4.1.0~beta2+dfsg-3","4.1.0~beta2+dfsg-3+deb13u1","4.1.0~beta2+dfsg-3+deb13u2","4.1.0~beta2+dfsg-4","4.1.0~beta2+dfsg-5","4.1.0~beta3+dfsg-1","4.1.0~beta4+dfsg-1","4.1.0~beta5+dfsg-1","4.1.1+dfsg-1","4.1.1+dfsg-1~bpo13+1","4.1.2+dfsg-1","4.1.2+dfsg-1~bpo13+1","4.1.3+dfsg-1","4.1.3+dfsg-1~bpo13+1","4.1.4+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.3+dfsg-1"}]}],"versions":["4.1.0+dfsg-1","4.1.0+dfsg-1~bpo13+1","4.1.0~beta2+dfsg-3","4.1.0~beta2+dfsg-4","4.1.0~beta2+dfsg-5","4.1.0~beta3+dfsg-1","4.1.0~beta4+dfsg-1","4.1.0~beta5+dfsg-1","4.1.1+dfsg-1","4.1.1+dfsg-1~bpo13+1","4.1.2+dfsg-1","4.1.2+dfsg-1~bpo13+1","4.1.3+dfsg-1~bpo13+1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.84-1ubuntu1","2.84-2","2.84-3","2.84-3ubuntu1","2.84-3ubuntu2","2.84-3ubuntu3","2.84-3ubuntu3.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.92-2ubuntu3","2.92-3ubuntu1","2.92-3ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.94-2ubuntu1","2.94-2ubuntu2","2.94-2ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.00-1ubuntu2","3.00-1ubuntu5","3.00-2ubuntu1","3.00-2ubuntu2","3.00-2ubuntu2.1","3.00-2ubuntu2.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.0.2-1ubuntu3","4.0.5-1","4.0.5-1build3","4.0.5-1build4","4.0.5-1build5","4.0.5-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.1+dfsg-1ubuntu1","4.1.2+dfsg-1ubuntu1","4.1.3+dfsg-1ubuntu1","4.1.3+dfsg-1ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"transmission","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0~beta2+dfsg-3ubuntu1","4.1.0~beta2+dfsg-3ubuntu2","4.1.0~beta4+dfsg-1ubuntu1","4.1.0~beta5+dfsg-1ubuntu1","4.1.0+dfsg-1ubuntu1","4.1.1+dfsg-1ubuntu1","4.1.1+dfsg-1ubuntu1.1"]}],"products":[{"vendor":"transmission","product":"transmission"}],"references":[{"url":"https://github.com/transmission/transmission/pull/8938","tags":["issue-tracking","patch","fix","report"]},{"url":"https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e","tags":["patch","fix","report"]},{"url":"https://github.com/transmission/transmission","tags":["product","package","report"]},{"url":"https://github.com/transmission/transmission/releases/tag/4.1.3","tags":["release-notes","advisory","report"]},{"url":"https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560","tags":["technical-description","article"]},{"url":"https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploit","tags":["third-party-advisory","advisory","report"]},{"url":"https://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116748","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-jw4h-7968-5hj9"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116748.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-116748","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-116748","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-116748","tags":["report"]},{"url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116748.json","tags":["report"]},{"url":"https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#l560","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/cve-2026-116748","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-116748","title":"Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","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.","status":"published","published":"2026-10-26T21:52:45.799Z","modified":"2026-10-31T02:02:38.641Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-942"],"updated_at":"2026-11-02T14:20:03.4818Z"}],"euvd":[{"id":"EUVD-2026-110496","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.","status":"published","published":"2026-10-26T21:52:45Z","modified":"2026-10-31T02:02:38Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T16:59:01.198534Z"}],"ghsa":[{"id":"GHSA-jw4h-7968-5hj9","title":"Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in handle_request() in...","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.","status":"published","published":"2026-10-27T00:32:49Z","modified":"2026-10-27T00:32:54Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-942"],"updated_at":"2026-11-02T15:14:27.349207Z"}],"nvd":[{"id":"CVE-2026-116748","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.","status":"published","published":"2026-10-26T22:16:59.61Z","modified":"2026-10-31T03:17:17.027Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-942"],"updated_at":"2026-11-02T14:13:03.746397Z"}],"osv":[{"id":"CVE-2026-116748","title":"Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","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.","status":"published","published":"2026-10-26T21:52:45.799Z","modified":"2026-11-11T13:20:21.030218866Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-942"],"updated_at":"2026-11-11T03:22:00.901153Z"},{"id":"DEBIAN-CVE-2026-116748","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.","status":"published","published":"2026-10-26T22:16:59.61Z","modified":"2026-10-31T10:00:51.279702315Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"updated_at":"2026-11-02T15:45:50.923612Z"},{"id":"UBUNTU-CVE-2026-116748","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.","status":"published","published":"2026-10-26T22:16:00Z","modified":"2026-10-28T20:17:46.315859454Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"},{"version":"4.0","score":8.7,"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","level":"high"},{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T16:56:00.081948Z"}]}}