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NVD Vulnerability Details :

CVE-2026-56020

Received

Source-9119a7d8-5eab-497f-8521-727c672e3725

Published At-18 Jun, 2026 | 17:16

Updated At-22 Jun, 2026 | 14:17

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	9.2	CRITICAL	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
Secondary	3.1	8.1	HIGH	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
			N/A
			N/A

Type: Secondary

Version: 4.0

Base score: 9.2

Base severity: CRITICAL

Vector:

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

Type: Secondary

Version: 3.1

Base score: 8.1

Base severity: HIGH

Vector:

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

Type: N/A

Version:

Base score:

Base severity: N/A

Vector:

Type: N/A

Version:

Base score:

Base severity: N/A

Vector:

Weaknesses

CWE ID	Type	Source
CWE-290	Secondary	9119a7d8-5eab-497f-8521-727c672e3725

CWE ID: CWE-290

Type: Secondary

Source: 9119a7d8-5eab-497f-8521-727c672e3725

References

Hyperlink	Source	Resource
https://github.com/webmin/webmin/releases/tag/2.641	9119a7d8-5eab-497f-8521-727c672e3725	N/A
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json	9119a7d8-5eab-497f-8521-727c672e3725	N/A
https://webmin.com/security/#webmin-prior-to-2641	9119a7d8-5eab-497f-8521-727c672e3725	N/A
https://www.cve.org/CVERecord?id=CVE-2026-56020	9119a7d8-5eab-497f-8521-727c672e3725	N/A