CVE-2026-116748highCWE-942

CVE-2026-116748: high-severity vulnerability in transmission

Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token

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36Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendcvss 8.7epss 1.2%
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.
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
Affected products
transmission · transmission
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In the same product, most dangerous first.

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