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CVE-2025-66558
Good to know:
Date: December 5, 2025
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 Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key
CWE-639Top Fix
Upgrade Version
Upgrade to version https://github.com/nextcloud/twofactor_webauthn.git - v1.4.2;https://github.com/nextcloud/twofactor_webauthn.git - v2.4.1
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | REQUIRED |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | LOW |
| Availability (A): | NONE |