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OpenAdvisories
High · 8.1 CVE-2026-56020 EUVD-2026-37909GHSA-23xj-gfh3-wf2h

Webmin HTTP header authentication bypass

Published Jun 18, 2026 · Updated Aug 11, 2026 · Assigned by cisa-cg

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.

Affected products

VendorProductAffectedFixed
Webmin Webmin < 2.202 2.202

Advisories 2

References