CVE-2026-42210: Webmin 2FA requirement bypass
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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch da18a16c84ae5c0b78cad79609cb0efb174000ec
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42210?
CVE-2026-42210 has a medium severity score of 5.3 as per the CVSS evaluation.
How do I fix CVE-2026-42210?
To mitigate CVE-2026-42210, upgrade Webmin to version 2.640 or later that addresses the 2FA requirement bypass.
What does CVE-2026-42210 affect?
CVE-2026-42210 affects Webmin, a web-based system administration tool for Unix-like servers.
What is the risk associated with CVE-2026-42210?
CVE-2026-42210 poses a risk by allowing attackers to bypass two-factor authentication if they have the username and password.
When was CVE-2026-42210 published?
CVE-2026-42210 was published on July 20, 2026.