low3.1
CVE-2025-66558
Nextcloud Twofactor WebAuthn is the WebAuthn Two-Factor Provider for Nextcloud.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Nextcloud | Two-Factor Webauthn | from 1.0.0 before 1.4.2 from 2.0.0 before 2.4.1 |
Weakness classification
References
- NVD record
- CVE.org record
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9q
- https://github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13d
- https://github.com/nextcloud/twofactor_webauthn/pull/881
- https://hackerone.com/reports/3360354