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Vulnerability · Published Jun 18, 2026 · Assigned by GitHub_M

CVE-2026-43915Coturn: Stored Cross-Site Scripting (XSS) in web-admin interface via TURN username

Medium 5.4

In plain English

A medium-severity cross-site scripting in coturn from coturn. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 84.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12coturnno fix listedDEBIAN-CVE-2026-43915
Debian:13coturnno fix listedDEBIAN-CVE-2026-43915
Debian:14coturn4.12.0-1DEBIAN-CVE-2026-43915
Ubuntu:22.04:LTScoturnno fix listedUBUNTU-CVE-2026-43915
Ubuntu:24.04:LTScoturnno fix listedUBUNTU-CVE-2026-43915
Ubuntu:25.10coturnno fix listedUBUNTU-CVE-2026-43915
Ubuntu:26.04:LTScoturnno fix listedUBUNTU-CVE-2026-43915

Affected products (as reported)

VendorProductVersions
coturn coturn < 4.11.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References