---
cve: "CVE-2026-65981"
severity: "HIGH"
cvss: 7.1
epss: "25%"
vendor: "coturn"
kev: false
exploited: false
published: "2026-07-31 21:17:31"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T04:07:23+02:00"
---

# CVE-2026-65981

> 7.1 HIGH · 🧪 PoC

## Beschreibung

Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.15.0, a server using --mobility authenticates a resumed REFRESH request with the resuming user's credentials but does not verify that identity against the original allocation owner, allowing an authenticated attacker who obtains a victim MOBILITY-TICKET to receive and inject relayed traffic and consume the victim's quota. In the handle_turn_refresh resume branch, the victim allocation (orig_ss) is located solely by the attacker-controlled mobile id, and credentials are only adopted (via copy_auth_parameters) when the resuming session is unauthenticated. Because the attacker's session already has hmackey_set set to 1 from its own prior authentication (which is never reset for long-term-credential sessions), the credential copy is skipped and check_stun_auth validates the REFRESH against the attacker's own identity rather than the allocation owner's. This issue is fixed in version 4.15.0.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Patch verfügbar (OSV)

- 37df0513168f830a7c9ce0a411db0300fa182f05 (Commit)

## Referenzen

- <https://github.com/coturn/coturn/security/advisories/GHSA-69wx-x7x6-pjj8>
- <https://github.com/coturn/coturn/commit/37df0513168f830a7c9ce0a411db0300fa182f05>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-65981) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_