CVE-2026-116748
Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Token
- State
- Published
- Severity
- 8.7 High
- Published
- Oct 26, 2026
- Updated
- Oct 26, 2026
- Reserved
- Oct 26, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-942 Permissive Cross-domain Security Policy with Untrusted Domains
Affected Products
| Product | Versions |
|---|---|
transmissiontransmission |
|
References
- Pull Request #8938issue-trackingpatch
- Patch Commitpatch
- https://github.com/transmission/transmissionproduct
- transmission 4.1.3 Release Notesrelease-notes
- https://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560technical-description
- https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploitthird-party-advisory
- VulnCheck Advisory: Transmission 4.0.0 before 4.1.3 Permissive CORS Leaks RPC Anti-CSRF Tokenthird-party-advisory
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