CVE-2026-56022

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 2.641.

Affected Software

Weaknesses

• CWE-308: CWE-308 Use of Single-factor Authentication

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://webmin.com/security/#webmin-prior-to-2641
• https://github.com/webmin/webmin/releases/tag/2.641
• https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
• https://www.cve.org/CVERecord?id=CVE-2026-56022

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