Improper Authentication in Webmin - CVE-2026-42210
Published: July 22, 2026
Vulnerability identifier: #VU139173
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42210
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Webmin
Affected software:
Webmin
Webmin
Detailed vulnerability description
The vulnerability allows a remote user to bypass two-factor authentication.
The vulnerability exists due to improper authentication in the Basic authentication mechanism when handling authentication requests. A remote user can authenticate using Basic authentication to bypass two-factor authentication.
Exploitation requires knowledge of a valid username and password for an account configured to require a second authentication factor, typically TOTP.
How to mitigate CVE-2026-42210
Install security update from vendor's website.