SB2025120510 - Authorization bypass through user-controlled key in Nextcloud Twofactor WebAuthn app
Published: December 5, 2025
Security Bulletin ID
SB2025120510
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Authorization bypass through user-controlled key (CVE-ID: CVE-2025-66558)
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to a missing ownership check. A remote user can take-away a 2FA webauthn device.
Remediation
Install update from vendor's website.