CVE-2026-56020

High

Description

The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.202.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Webmin

PublishedJun 18, 2026

First seenJun 18, 2026

Weakness typeCWE-290CWE-290

How to fix

Update

Webmin Webmin2.202 or later

Vendor advisories

github.com/webmin/webmin/releases/tag/2.202
webmin.com/security/#webmin-prior-to-2202

Affected products

Product	Affected versions	Fixed in
Webmin Webmin	v < 2.202	2.202

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