Unrated severityNVD Advisory· Published Dec 5, 2025· Updated Dec 5, 2025
Nextcloud Twofactor WebAuthn app was updated based on public key
CVE-2025-66558
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.
Affected products
2- Range: <2.4.1, <1.4.2
- nextcloud/security-advisoriesv5Range: < 1.4.2
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9qmitrex_refsource_CONFIRM
- github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13dmitrex_refsource_MISC
- github.com/nextcloud/twofactor_webauthn/pull/881mitrex_refsource_MISC
- hackerone.com/reports/3360354mitrex_refsource_MISC
News mentions
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