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CVE-2025-66558

nvd nist
Published: Dec 5, 2025Modified: Jun 17, 2026

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4.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Exploitability: 2.8 / Impact: 1.4
Source: NVD

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 (2)

Nextcloud
1 product
Two Factor Webauthn
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Nextcloud
Two Factor Webauthn
From 1.0.0 to 1.4.2
Two Factor Webauthn
From 2.0.0 to 2.4.1

Related CWEs

CWE-639
Authorization Bypass Through User-Controlled Key
The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

References (4)

Source: security-advisories@github.com
PatchVendor Advisory
Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Issue TrackingPatch
Source: security-advisories@github.com
Permissions RequiredVendor Advisory

Timeline

No history available yet.