CVE-2025-66558

The issue affects Nextcloud Twofactor WebAuthn (WebAuthn Two-Factor Provider). Before versions 1.4.2 and 2.4.1, a missing ownership check allowed an attacker to remove a victim’s WebAuthn 2FA device by correctly guessing an 80–128 character random string. After a successful guess, the victim was ...

CVE-2025-66558 Nextcloud Twofactor WebAuthn app was updated based on public key

Nextcloud Twofactor WebAuthn is the WebAuthn Two-Factor Provider for Nextcloud. Prior to 1.4.2 and 2.4.1, a missing ownership check allowed an attack to take-away a 2FA webauthn device when correctly guessing a 80-128 character long random string of letters, numbers and symbols. The victim would...