CVE-2026-56020

Name: CVE-2026-56020
Creator: NVD / NIST
Published: 2026-06-18T17:16:35.247+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.2/10EPSS 0.29%

Last modified Jun 22, 2026

This CVE is reserved or awaiting analysis. Details will appear once published by NVD.

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 2.641.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS 4.0

9.2/10

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.29%

20.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

References

Timeline

Published: Jun 18, 2026
Last Modified: Jun 22, 2026
Status: Awaiting Analysis

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Source: NVD / NIST