High severity8.8NVD Advisory· Published Oct 26, 2026
CVE-2026-116748
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.
Affected products
1- Range: <4.1.3
Patches
Vulnerability mechanics
References
6- github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.ccnvd
- github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929envd
- github.com/transmission/transmission/pull/8938nvd
- github.com/transmission/transmission/releases/tag/4.1.3nvd
- joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploitnvd
- www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-tokennvd
News mentions
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