CVE-2026-43915: Coturn is a free open source implementation of TURN and STUN Server

Q: How do I fix CVE-2026-43915?

coturn: upgrade to 4.11.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-43915 being exploited?

CVE-2026-43915 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43915 affect?

CVE-2026-43915 affects coturn. Severity is medium (CVSS 5.4). 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 cr

Q: How urgent is CVE-2026-43915?

Priority 23/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2026-43915 is a medium-severity flaw (CVSS 5.4) affecting coturn. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-18
Last modified	2026-06-26

Publisher (CNA): GitHub, Inc. · Vendor: coturn project

Last updated 2026-06-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-18 20:16 UTCPublished CVE record published
2026-06-26 02:35 UTCUpdated Record last modified

coturn project coturn UPGRADE

Affected: < 4.11.0

Fixed in: 4.11.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy coturn || rpm -q coturn || coturn --version

2. UPGRADE to 4.11.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade coturn

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade coturn

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43915?

coturn: upgrade to 4.11.0. Exact commands for each OS are on this page.

Is CVE-2026-43915 being exploited?

CVE-2026-43915 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43915 affect?

CVE-2026-43915 affects coturn. Severity is medium (CVSS 5.4). 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 cr

How urgent is CVE-2026-43915?

Priority 23/100. No elevated risk signals yet.

Related CVEs

CVE-2026-53450 HIGH 7.4 UPGRADE Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-53448 HIGH 7.2 UPGRADE Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-53449 MEDIUM 6.0 UPGRADE Coturn is a free open source implementation of TURN and STUN Server
CVE-2026-43994 HIGH 8.1 UPGRADE Coturn is a free open source implementation of TURN and STUN Server

References

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