CVE-2026-42210 Webmin 2FA requirement bypass
Attackers can bypass two-factor authentication in Webmin using Basic authentication if they know the username and password.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42210?
CVE-2026-42210 is a medium-severity authentication bypass vulnerability in webmin, published on 20 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-42210?
How do I fix CVE-2026-42210?
No fix has been published for CVE-2026-42210 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-42210 being exploited?
There is no known exploitation of CVE-2026-42210 in the wild and no public exploit code.
Sources
Also known as GHSA-qpww-fff2-6fgv.