CVE-2026-116748

HIGH

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 v3.1 Score

8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 10/26/2026Modified: 10/27/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-116748 — Transmission 4.0.0 before 4.1.3 contains a permissive CORS vulnerability in hand...

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.

CVE-2026-116748
NIST NVD

References (7)

https://github.com/transmission/transmissionhttps://github.com/transmission/transmission/blob/4.1.2/libtransmission/rpc-server.cc#L560https://github.com/transmission/transmission/commit/c6a1bd2017a0fea9c956737c213f23e4b0f7929ehttps://github.com/transmission/transmission/pull/8938https://github.com/transmission/transmission/releases/tag/4.1.3https://joshua.hu/transmission-cors-rpc-csrf-rce-drive-by-exploithttps://www.vulncheck.com/advisories/transmission-4.0.0-before-4.1.3-permissive-cors-leaks-rpc-anti-csrf-token