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CVE-2026-65981— Coturn: MOBILITY-TICKET session-resume authorization bypass allows cross-user TURN allocation takeover

Quick assessment

Affected
coturn coturn
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的开源实现。 Coturn 4.15.0之前版本存在授权问题漏洞，该漏洞源于恢复REFRESH请求时身份验证不当，未验证恢复用户身份与原始分配所有者的一致性，可能导致已认证攻击者获取受害者MOBILITY-TICKET后接收和注入中继流量并消耗受害者配额。

CVSS 7.1 · High EPSS 0.39% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
coturn coturn < 4.15.0 affected
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I. Basic Information for CVE-2026-65981

Vulnerability Information
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Vulnerability Title
Coturn: MOBILITY-TICKET session-resume authorization bypass allows cross-user TURN allocation takeover
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Coturn 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coturn是Coturn组织开源的一款TURN(VoIP媒体业务NAT穿越服务器和网关)和STUN(用户数据报协议简单穿越网络地址转换器)Server的开源实现。 Coturn 4.15.0之前版本存在授权问题漏洞，该漏洞源于恢复REFRESH请求时身份验证不当，未验证恢复用户身份与原始分配所有者的一致性，可能导致已认证攻击者获取受害者MOBILITY-TICKET后接收和注入中继流量并消耗受害者配额。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coturn coturn < 4.15.0 -

II. Public POCs for CVE-2026-65981

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10945 chars
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III. Intelligence Information for CVE-2026-65981

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Patches & Fixes for CVE-2026-65981 (1)

Vendor Advisories for CVE-2026-65981 (1)

IV. Related Vulnerabilities

Same product: coturn
Same vendor: coturn
Same weakness: CWE-639

V. Comments for CVE-2026-65981

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