Low severity3.1NVD Advisory· Published Dec 5, 2025· Updated Jun 17, 2026
CVE-2025-66558
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
4<1.4.2, <2.4.1+ 1 more
- (no CPE)range: <1.4.2, <2.4.1
- cpe:2.3:a:nextcloud:two-factor_webauthn:*:*:*:*:*:*:*:*range: >=1.0.0,<1.4.2
- Range: < 1.4.2
Patches
Vulnerability mechanics
References
4- github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9qnvdPatchVendor Advisory
- github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13dnvdPatch
- github.com/nextcloud/twofactor_webauthn/pull/881nvdIssue TrackingPatch
- hackerone.com/reports/3360354nvdPermissions RequiredVendor Advisory
News mentions
0No linked articles in our index yet.