CVE-2026-56022
Webmin MFA bypass
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.
INFO
Published Date :
June 18, 2026, 5:16 p.m.
Last Modified :
Aug. 11, 2026, 5:05 p.m.
Remotely Exploit :
Yes !
Source :
9119a7d8-5eab-497f-8521-727c672e3725
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 9119a7d8-5eab-497f-8521-727c672e3725 | |||||
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 9119a7d8-5eab-497f-8521-727c672e3725 | ||||
| CVSS 4.0 | MEDIUM | 9119a7d8-5eab-497f-8521-727c672e3725 |
Solution
- Update Webmin to version 2.641 or later.
- Remove the 'User-Agent: webmin' header if possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-56022.
| URL | Resource |
|---|---|
| https://github.com/webmin/webmin/releases/tag/2.640 | Release Notes |
| https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json | VDB Entry |
| https://webmin.com/security/#webmin-prior-to-2640 | Vendor Advisory |
| https://www.cve.org/CVERecord?id=CVE-2026-56022 | VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-56022 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-56022
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-56022 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-56022 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 11, 2026
Action Type Old Value 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 9119a7d8-5eab-497f-8521-727c672e3725
Aug. 11, 2026
Action Type Old Value New Value Changed Affected [{'vendor': 'Webmin', 'product': 'Webmin', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.641', 'versionType': 'custom'}, {'status': 'unaffected', 'version': '2.641'}], 'defaultStatus': 'unknown'}] [{'vendor': 'Webmin', 'product': 'Webmin', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.640', 'versionType': 'custom'}, {'status': 'unaffected', 'version': '2.640'}], 'defaultStatus': 'unknown'}] 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 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 24, 2026
Action Type Old Value New Value Added SSVC {'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'} -
New CVE Received by 9119a7d8-5eab-497f-8521-727c672e3725
Jun. 18, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Webmin', 'product': 'Webmin', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '2.641', 'versionType': 'custom'}, {'status': 'unaffected', 'version': '2.641'}], 'defaultStatus': 'unknown'}] Added SSVC {'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'} 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