Vulnerability DatabaseCVE-2026-56020
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CVE-2026-56020
Published:June 18, 2026
Updated:June 29, 2026
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.
Affected Packages
https://github.com/webmin/webmin.git (GITHUB):
Affected version(s) >=1.700 <2.641
Fix Suggestion:
Update to version 2.641
Related Resources (4)
https://github.com/webmin/webmin/releases/tag/2.641
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
https://www.cve.org/CVERecord?id=CVE-2026-56020
https://webmin.com/security/#webmin-prior-to-2641
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CVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Authentication Bypass by Spoofing
CWE-290
EPSS
Base Score:
0.29