VULNERABILITY INTELLIGENCE

CVE-2025-66558

CVSS score3.1 LOW
EPSS probability0.28%
CISA KEVNot currently listed
Published2025-12-05
Last modified2026-10-15
CVSS vectorCVSS: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.

Weakness classification

  • security-advisories@github.com: CWE-639

Primary references