CVE-2026-56022

6.9 mediumEPSS 0.6%

Medium (6.9) in webmin webmin. EPSS 0.6% chance of exploitation in the next 30 days.

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.

Severity

CVSS 4.0

6.9 medium

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 3.1

5.3 medium

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

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-31)
CWE: CWE-308
Published: 2026-06-18
Modified: 2026-08-11
Record from: the NVD, synced 2026-10-19

Affected

webmin:webmin

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

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