CVE-2025-66558Nextcloud Twofactor WebAuthn is the WebAuthn Two-Factor Provider for Nextcloud.
Updated under an hour ago ()
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It affects nextcloud two-factor_webauthn. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-639
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nextcloud two-factor_webauthn nextcloud:two-factor_webauthn | from 1.0.0 before 1.4.2; from 2.0.0 before 2.4.1 | NVD |
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fr8x-mvjg-wf9qpatch, vendor-advisory
- https://github.com/nextcloud/twofactor_webauthn/commit/5d2302166d31ee2e01b2e21556bd5372156da13dpatch
- https://github.com/nextcloud/twofactor_webauthn/pull/881issue-tracking, patch
- https://hackerone.com/reports/3360354permissions-required, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.