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
| Link | Resource |
|---|---|
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9q | Patch Vendor Advisory |
| https://github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13d | Patch |
| https://github.com/nextcloud/twofactor_webauthn/pull/881 | Issue Tracking Patch |
| https://hackerone.com/reports/3360354 | Permissions Required Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
09 Dec 2025, 16:44
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:nextcloud:two-factor_webauthn:*:*:*:*:*:*:*:* | |
| First Time |
Nextcloud
Nextcloud two-factor Webauthn |
|
| References | () https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9q - Patch, Vendor Advisory | |
| References | () https://github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13d - Patch | |
| References | () https://github.com/nextcloud/twofactor_webauthn/pull/881 - Issue Tracking, Patch | |
| References | () https://hackerone.com/reports/3360354 - Permissions Required, Vendor Advisory |
05 Dec 2025, 18:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-12-05 18:15
Updated : 2025-12-09 16:44
NVD link : CVE-2025-66558
Mitre link : CVE-2025-66558
CVE.ORG link : CVE-2025-66558
JSON object : View
Products Affected
nextcloud
- two-factor_webauthn
CWE
CWE-639
Authorization Bypass Through User-Controlled Key