CVE-2026-56020CWE-290

CVE-2026-56020

High · published June 18, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
41.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00495 · 41.5th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-06-18T21:16Z
References (4)
https://github.com/webmin/webmin/releases/tag/2.202 · 9119a7d8-5eab-497f-8521-727c672e3725https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json · 9119a7d8-5eab-497f-8521-727c672e3725https://webmin.com/security/#webmin-prior-to-2202 · 9119a7d8-5eab-497f-8521-727c672e3725https://www.cve.org/CVERecord?id=CVE-2026-56020 · 9119a7d8-5eab-497f-8521-727c672e3725
EPSS history
Timeline
  • 18 JUN 16:12Z
    Webmin HTTP header authentication bypass
    cvelistv5