CVE-2026-43915CWE-79

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

Medium · published June 18, 2026

CVSS v3.1
5.4
EPSS
0%
Percentile
14.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.4 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00240 · 14.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-18T19:33Z
EPSS history
Timeline
  • 18 JUN 19:33Z
    Coturn: Stored Cross-Site Scripting (XSS) in web-admin interface via TURN username
    cvelistv5