CVE-2026-56022

Webmin MFA bypass

Published Jun 18, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Description
Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
CPEs cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Description Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.641. Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.
References
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Webmin
Webmin webmin
Vendors & Products Webmin
Webmin webmin
Type Values Removed Values Added
Description Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.641.
Title Webmin MFA bypass
Weaknesses CWE-308
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisa-cg
Published
Updated
Aug 11, 2026, 3:33 PM
Reserved
Jun 18, 2026, 2:15 PM
Status
Analyzed
Published
Jun 18, 2026, 5:16 PM
Modified
Aug 11, 2026, 5:05 PM