CVE-2026-56022

EUVD-2026-37907
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 44.92%
Affected Products (NVD)
VendorProductVersion
webminwebmin
𝑥
< 2.640
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://github.com/webmin/webmin/releases/tag/2.640
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
https://webmin.com/security/#webmin-prior-to-2640
https://www.cve.org/CVERecord?id=CVE-2026-56022