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VULNERABILITIES

CVE-2026-56020 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian GovernmentCVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://github.com/webmin/webmin/releases/tag/2.202 Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
https://webmin.com/security/#webmin-prior-to-2202 Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
https://www.cve.org/CVERecord?id=CVE-2026-56020 Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Weakness Enumeration

CWE-IDCWE NameSource
CWE-290Authentication Bypass by SpoofingCybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Affected Products

No affected product data is available for this CVE.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-56020
NVD Published Date:
Jun 18, 2026
NVD Last Modified:
Aug 11, 2026
Source:
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government
CVE-2026-56020 Details - Not Deferred