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TI-2026-40416 Aliases CVE-2026-56022GHSA-9848-6qgw-2748

Webmin MFA bypass

Priority LOW 31CWE-308Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00555 46th percentileScored 2026-11-07
Fix Fixed Webmin (Webmin): 2.640

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WebminWebminbefore 2.6402.640Patch availableCNA
  • Webmin VendorWebmin Affected before 2.640 Fixed in 2.640 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:*before 2.640VulnerableWebmin
  • cpe:2.3:a:webmin:webmin:*:*:*:*:*:*:*:* Versions before 2.640 Vulnerable ·Webmin

Remediation

  • Fix · CNA Webmin (Webmin) Fixed in 2.640

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56022
  2. 2026-10-03 Alias added: GHSA-9848-6qgw-2748

References

Advisory 2

Other 2

  • TI-2019-11278 An issue was discovered in Webmin <=1.920. KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-16770 software/apt-lib.pl in Webmin before 1.997 lacks HTML escaping for a UI command. CVSS 3.1CRITICAL 9.8
  • TI-2022-00731 Improper Access Control to Remote Code Execution in webmin/webmin CVSS 3.1HIGH 8.8
  • TI-2019-09619 In Webmin through 1.910, any user authorized to the "Package Updates" module can execute… CVSS 3.0HIGH 8.8
  • TI-2021-11777 Webmin 1.973 is affected by reflected Cross Site Scripting (XSS) to achieve Remote… CVSS 3.1CRITICAL 9.6
  • TI-2024-11888 OS command injection in Webmin CVSS 3.1HIGH 8.8
See all 95 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences