CVE-2026-56022

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.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
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://webmin.com/security/#webmin-prior-to-2641
https://www.cve.org/CVERecord?id=CVE-2026-56022

Configurations

No configuration.

History

18 Jun 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-18 17:16

Updated : 2026-06-24 21:16

NVD link : CVE-2026-56022

Mitre link : CVE-2026-56022

CVE.ORG link : CVE-2026-56022

JSON object : View

Products Affected

No product.

CWE

CWE-308

Use of Single-factor Authentication

{"id": "CVE-2026-56022", "cveTags": [], "metrics": {"ssvcV203": [{"source": "9119a7d8-5eab-497f-8521-727c672e3725", "ssvcData": {"id": "CVE-2026-56022", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-05-29T20:06:09.689996Z"}}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56022", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-24T19:54:55.353387Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "9119a7d8-5eab-497f-8521-727c672e3725", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "9119a7d8-5eab-497f-8521-727c672e3725", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "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", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "LOW", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "9119a7d8-5eab-497f-8521-727c672e3725", "affectedData": [{"vendor": "Webmin", "product": "Webmin", "versions": [{"status": "affected", "version": "0", "lessThan": "2.641", "versionType": "custom"}, {"status": "unaffected", "version": "2.641"}], "defaultStatus": "unknown"}]}], "published": "2026-06-18T17:16:35.530", "references": [{"url": "https://github.com/webmin/webmin/releases/tag/2.641", "source": "9119a7d8-5eab-497f-8521-727c672e3725"}, {"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json", "source": "9119a7d8-5eab-497f-8521-727c672e3725"}, {"url": "https://webmin.com/security/#webmin-prior-to-2641", "source": "9119a7d8-5eab-497f-8521-727c672e3725"}, {"url": "https://www.cve.org/CVERecord?id=CVE-2026-56022", "source": "9119a7d8-5eab-497f-8521-727c672e3725"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "9119a7d8-5eab-497f-8521-727c672e3725", "description": [{"lang": "en", "value": "CWE-308"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-06-24T21:16:58.237", "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725"}