CVE-2025-66558

Nextcloud Twofactor WebAuthn app was updated based on public key

Published Dec 5, 2025 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Nextcloud two-factor Webauthn
CPEs cpe:2.3:a:nextcloud:two-factor_webauthn:*:*:*:*:*:*:*:*
Vendors & Products Nextcloud two-factor Webauthn
Type Values Removed Values Added
First Time appeared Nextcloud
Nextcloud twofactor Webauthn
Vendors & Products Nextcloud
Nextcloud twofactor Webauthn
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Nextcloud Twofactor WebAuthn app was updated based on public key
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 5, 2025, 6:35 PM
Reserved
Dec 4, 2025, 4:01 PM
Status
Analyzed
Published
Dec 5, 2025, 6:15 PM
Modified
Oct 15, 2026, 9:10 PM