CVE-2026-56020

CRITICAL EPSS 20.2%
Published Jun 18, 20262w ago · Modified Jun 22, 20261w ago
9.2 CVSS 4.0
Critical
Find Similar
Published Jun 18, 2026 2w ago
Last Modified Jun 22, 2026 1w ago

Description

The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.641.

CVSS Details

Base Score
9.2
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
20.2% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-290

References 4

  • github.com https://github.com/webmin/webmin/releases/tag/2.641
  • raw.githubusercontent.com https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
  • webmin.com https://webmin.com/security/#webmin-prior-to-2641
  • cve.org https://www.cve.org/CVERecord?id=CVE-2026-56020

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.