Webmin MFA bypass

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-56022
StatePUBLISHED
Assignercisa-cg
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-18 17:16:35 UTC
Updated2026-08-11 17:05:35 UTC
DescriptionWebmin 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from 9119a7d8-5eab-497f-8521-727c672e3725

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/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: 0.005550000 probability, percentile 0.434570000 (date 2026-08-12)

Problem Types: CWE-308 | CWE-308 CWE-308 Use of Single-factor Authentication

VersionSourceTypeScoreSeverityVector
4.09119a7d8-5eab-497f-8521-727c672e3725Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.19119a7d8-5eab-497f-8521-727c672e3725Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Webmin Webmin All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Webmin Webmin affected 2.640 custom Not specified
CNA Webmin Webmin unaffected 2.640 Not specified

References

ReferenceSourceLinkTags
webmin.com/security 9119a7d8-5eab-497f-8521-727c672e3725 webmin.com Vendor Advisory
www.cve.org/CVERecord 9119a7d8-5eab-497f-8521-727c672e3725 www.cve.org VDB Entry
raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json 9119a7d8-5eab-497f-8521-727c672e3725 raw.githubusercontent.com VDB Entry
github.com/webmin/webmin/releases/tag/2.640 9119a7d8-5eab-497f-8521-727c672e3725 github.com Release Notes
github.com/webmin/webmin/releases/tag/2.641 MITRE github.com
webmin.com/security MITRE webmin.com
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Adem El Adeb, vulone.com/vul1.com (en)

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