PT-2026-50711 · Webmin · Webmin

Published 2026-06-18 · Updated 2026-06-18 · CVE-2026-56020

NVD

CVSS v3.1

8.1

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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 2.641.

Fix

Authentication Bypass by Spoofing

Weakness Enumeration

CWE-290

Related Identifiers

CVE-2026-56020

Affected Products

Webmin

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-56020 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-56020 · Security Note
• https://github.com/webmin/webmin/releases/tag/2.641 · Note
• https://webmin.com/security/#webmin-prior-to-2641 · Note
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json · Note