Vulnerability · Published Jul 20, 2026 · Assigned by GitHub_M

CVE-2026-42210Webmin 2FA requirement bypass

Medium 5.3

In plain English

A medium-severity improper authentication in webmin from webmin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.5%top 55.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
webmin	webmin	< 2.640

Weakness: CWE-287 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

References

https://github.com/webmin/webmin/security/advisories/GHSA-qpww-fff2-6fgv x_refsource_CONFIRM
https://github.com/webmin/webmin/commit/da18a16c84ae5c0b78cad79609cb0efb174000ec x_refsource_MISC