CVE-2026-42210: Webmin

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Webmin is a web-based system administration tool for Unix-like servers. Prior to version 2.640, for Webmin accounts that require a second authentication factor (typically TOTP), an attacker with knowledge of the username and password can bypass the 2FA requirement by using Basic authentication. Webmin is a web-based system administration tool for Unix-like servers. As a workaround, apply the patch from commit da18a16c84ae5c0b78cad79609cb0efb174000ec manually.

Affected products

• Webmin Webmin: before 2.640 (fixed in 2.640)

Published 2026-07-20. Last modified 2026-07-23.