{"id":"CVE-2026-116748","state":"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.","publishedAt":"2026-10-26T21:52:45.799Z","updatedAt":"2026-10-26T21:52:45.799Z","severity":{"score":8.7,"label":"High","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["transmission transmission"],"affected":[{"vendor":"transmission","product":"transmission","packageURL":"pkg:github/transmission/transmission","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.1.3","versionType":"semver"}],"repo":"https://github.com/transmission/transmission"}],"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"],"weaknesses":["CWE-942"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/116xxx/CVE-2026-116748.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116748","state":"PUBLISHED","datePublished":"2026-10-26T21:52:45.799Z","dateUpdated":"2026-10-26T21:52:45.799Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-26T20:23:37.457Z"},"containers":{"cna":{"title":"Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"transmission","product":"transmission","packageURL":"pkg:github/transmission/transmission","defaultStatus":"unaffected","versions":[{"version":"4.0.0","status":"affected","lessThan":"4.1.3","versionType":"semver"}],"repo":"https://github.com/transmission/transmission"}],"references":[{"url":"https://github.com/transmission/transmission/pull/8938","tags":["issue-tracking","patch"],"name":"Pull Request #8938"},{"url":"https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929e","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/transmission/transmission","tags":["product"]},{"url":"https://github.com/transmission/transmission/releases/tag/4.1.3","tags":["release-notes"],"name":"transmission 4.1.3 Release Notes"},{"url":"https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560","tags":["technical-description"]},{"url":"https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploit","tags":["third-party-advisory"]},{"url":"https://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token","name":"VulnCheck Advisory: Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-942","lang":"en","description":"Permissive Cross-domain Security Policy with Untrusted Domains","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-26T21:52:45.799Z"},"datePublic":"2026-06-25T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:transmissionbt:transmission:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0","versionEndExcluding":"4.1.3"}]}]}],"credits":[{"lang":"en","value":"Joshua Rogers","type":"finder"},{"lang":"en","value":"ckerr","type":"remediation developer"}],"x_generator":{"engine":"vulncheck-endgame"}}}}}