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

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 handleturnrefresh resume branch, the victim allocation (origss) is located solely by the attacker-controlled mobile id, and credentials are only adopted (via copyauthparameters) when the resuming session is unauthenticated. Because the attacker's session already has hmackeyset set to 1 from its own prior authentication (which is never reset for long-term-credential sessions), the credential copy is skipped and checkstunauth validates the REFRESH against the attacker's own identity rather than the allocation owner's. This issue is fixed in version 4.15.0.