Detections
Analytics
CVE-2025-66558
medium
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.
References
https://hackerone.com/reports/3360354
https://github.com/nextcloud/twofactor_webauthn/pull/881
https://github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13d
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9q