CVE-2025-66558 LOW

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

Vendor Nextcloud
Product security-advisories
Weakness CWE-639 · IDOR
Published December 5, 2025
Last update December 5, 2025
View on NVD All CVEs

CVSS base score

3.1/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 5, 2025 CVE published
December 5, 2025 Record updated