CVE-2025-66558
3.1 · LOWOverview
CVE-2025-66558 is a low-severity vulnerability affecting nextcloud two-factor_webauthn. It was published on December 5, 2025 and has a CVSS 3.1 base score of 3.1 (LOW).
This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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
Check the references section for vendor advisories and patches from nextcloud. Update two-factor_webauthn to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| nextcloud | two-factor_webauthn | >= 1.0.0, < 1.4.2 | Affected |
Frequently Asked Questions
What is CVE-2025-66558?
CVE-2025-66558 is a low-severity vulnerability affecting nextcloud two-factor_webauthn. It was published on December 5, 2025 and has a CVSS 3.1 base score of 3.1 (LOW).
How severe is CVE-2025-66558?
This vulnerability has a CVSS 3.1 base score of 3.1, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-66558?
Check the references section for vendor advisories and patches from nextcloud. Update two-factor_webauthn to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66558?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66558 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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