NVD

CVE-2026-56022 Detail

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

Nist CVSS score does not match with CNA score

CNA: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

CVSS-B 6.9 MEDIUM

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

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

CNA: Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Base Score: 5.3 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/webmin/webmin/releases/tag/2.640	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government	Release Notes
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government	VDB Entry
https://webmin.com/security/#webmin-prior-to-2640	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government	Vendor Advisory
https://www.cve.org/CVERecord?id=CVE-2026-56022	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government	VDB Entry

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-308	Use of Single-factor Authentication	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Initial Analysis by NIST 8/11/2026 1:05:35 PM

Action	Type	New Value
Added	CPE Configuration	OR cpe:2.3:a:webmin:webmin::::::::* versions up to (excluding) 2.640
Added	Reference Type	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://github.com/webmin/webmin/releases/tag/2.640 Types: Release Notes
Added	Reference Type	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json Types: VDB Entry
Added	Reference Type	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://webmin.com/security/#webmin-prior-to-2640 Types: Vendor Advisory
Added	Reference Type	Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government: https://www.cve.org/CVERecord?id=CVE-2026-56022 Types: VDB Entry

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 8/11/2026 12:17:33 PM

Action	Type	Old Value	New Value
Changed	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.
Added	Reference		https://github.com/webmin/webmin/releases/tag/2.640
Added	Reference		https://webmin.com/security/#webmin-prior-to-2640
Removed	Reference	https://github.com/webmin/webmin/releases/tag/2.641
Removed	Reference	https://webmin.com/security/#webmin-prior-to-2641
Changed	Affected	[{"vendor":"Webmin","product":"Webmin","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"2.641","versionType":"custom","status":"affected"},{"version":"2.641","status":"unaffected"}]}]	[{"vendor":"Webmin","product":"Webmin","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"2.640","versionType":"custom","status":"affected"},{"version":"2.640","status":"unaffected"}]}]

New CVE Received from Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 6/18/2026 1:16:35 PM

Action	Type	New Value
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.
Added	CVSS V4.0	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
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Added	CWE	CWE-308
Added	Reference	https://github.com/webmin/webmin/releases/tag/2.641
Added	Reference	https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
Added	Reference	https://webmin.com/security/#webmin-prior-to-2641
Added	Reference	https://www.cve.org/CVERecord?id=CVE-2026-56022
Added	Affected	[{"vendor":"Webmin","product":"Webmin","defaultStatus":"unknown","versions":[{"version":"0","lessThan":"2.641","versionType":"custom","status":"affected"},{"version":"2.641","status":"unaffected"}]}]
Added	SSVC	{"timestamp":"2026-05-29T20:06:09.689996Z","id":"CVE-2026-56022","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

Quick Info

CVE Dictionary Entry:
CVE-2026-56022
NVD Published Date:
06/18/2026
NVD Last Modified:
08/11/2026
Source:
Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2026-56022 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

Initial Analysis by NIST 8/11/2026 1:05:35 PM

CVE Modified by Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 8/11/2026 12:17:33 PM

CVE Modified by CISA-ADP 6/24/2026 5:16:58 PM

New CVE Received from Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government 6/18/2026 1:16:35 PM

Quick Info