3.1
/ 10
LOW
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
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.
Basic Information
ID
CVE-2025-66558
Source
GitHub_M
Published
Dec 5, 2025 at 18:00
Modified
Dec 5, 2025 at 18:35
Affected Product
Vendor
nextcloud
Product
security-advisories
Version
< 1.4.2
Affected Versions
nextcloud security-advisories < 1.4.2
nextcloud security-advisories >= 2.0.0-beta.1, < 2.4.1
nextcloud security-advisories >= 2.0.0-beta.1, < 2.4.1