CVE-2025-66558
Last modified
CVE-2025-66558 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Two-Factor Webauthn | >= 1.0.0, < 1.4.2 |
| Nextcloud | Two-Factor Webauthn | >= 2.0.0, < 2.4.1 |
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9qPatch, Vendor Advisory
- https://github.com/nextcloud/twofactor_webauthn/pull/881Issue Tracking, Patch
- https://hackerone.com/reports/3360354Permissions Required, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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