Authentication Bypass Vulnerability in Webmin by Webmin
CVE-2026-56022

6.9MEDIUM

Key Information:

Vendor

Webmin

Status
Webmin
Vendor
CVE Published:
18 June 2026

What is CVE-2026-56022?

Webmin has a vulnerability that allows attackers to bypass multi-factor authentication when they present a specific 'User-Agent: webmin' header. This flaw permits access without the use of session cookies, potentially exposing sensitive systems to unauthorized remediation. The issue has been addressed in version 2.641.

Affected Version(s)

Webmin 0 < 2.641

Webmin 2.641

References

https://webmin.com/security/#webmin-prior-to-2641
release-notes
https://github.com/webmin/webmin/releases/tag/2.641
release-notes
https://raw.githubusercontent.com/cisagov/CSAF/develop/cs...

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Adem El Adeb, vulone.com/vul1.com
.