CVE-2026-43915: Coturn Project Coturn

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

Coturn is a free open source implementation of TURN and STUN Server. Versions prior to 4.11.0 contain a stored cross-site scripting (XSS) vulnerability in the web-admin HTTPS interface. An attacker who can create a TURN allocation with a crafted USERNAME value can inject HTML/JavaScript that executes when an authenticated web-admin user views the TURN session list. In configurations using anonymous TURN access (--no-auth), this may be exploitable without TURN credentials. In authenticated deployments, exploitation requires valid TURN credentials or control over a provisioned username. This issue has been fixed in version 4.11.0.

Affected products

• Coturn Project Coturn: before 4.11.0 (fixed in 4.11.0)

Published 2026-06-18. Last modified 2026-06-26.