5.4

CVE-2026-43915: coturn_project coturn Cross-site Scripting

CVSS: 5.4v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43915DEBIAN-CVE-2026-43915
Published 18-06-2026Last modified 18-06-2026
Open JSON

Vulnerability summary

CVE-2026-43915 is a medium (CVSS 5.4) Cross-site Scripting vulnerability in coturn_project coturn. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.2% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:11617-1

Timeline

  1. 18-06-2026
    PublishedVulnerability first disclosed.
  2. 18-06-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Coturn1 product
Coturn_project1 product
Debian1 product
  • coturnAll versions (No fix recorded) | < 4.12.0-1
Ubuntu1 product
  • coturnAll versions (No fix recorded)

4 vendors · 4 products

References

5 links