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

CVE ID : CVE-2025-66558

Published : Dec. 5, 2025, 6:15 p.m. | 49 minutes ago

Description : 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 then be prompted to register a new device on the next login. The attacker can not authenticate as the victim. This vulnerability is fixed in 1.4.2 and 2.4.1.

Severity: 3.1 | LOW

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