CVE-2025-66558

CWE-639 — Insecure Direct Object Reference2 documents2 sources

Severity

4.3MEDIUM

EPSS

0.0%

top 93.26%

CISA KEV

Not in KEV

Exploit

No known exploits

Affected products

Nextcloud Security-advisories Nextcloud Two-factor Webauthn

Timeline

PublishedDec 5

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.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:NExploitability: 1.6 | Impact: 1.4

Affected Packages2 packages

▶NVDnextcloud/two-factor_webauthn1.0.0 — 1.4.2+1

▶CVEListV5nextcloud/security-advisories< 1.4.2+1

Patches

Patch: github.com ↗Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

CVEList

Nextcloud Twofactor WebAuthn app was updated based on public key↗2025-12-05

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