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CVE Vulnerability Details :
CVE-2026-56020
PUBLISHED
More InfoOfficial Page
Assigner-cisa-cg
Assigner Org ID-9119a7d8-5eab-497f-8521-727c672e3725
View Known Exploited Vulnerability (KEV) details
Published At-18 Jun, 2026 | 16:12
Updated At-22 Jun, 2026 | 12:33
Rejected At-
▼CVE Numbering Authority (CNA)
Webmin HTTP header authentication bypass

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.

Affected Products
Vendor
WebminWebmin
Product
Webmin
Default Status
unknown
Versions
Affected
  • From 0 before 2.641 (custom)
Unaffected
  • 2.641
Problem Types
TypeCWE IDDescription
CWECWE-290CWE-290 Authentication Bypass by Spoofing
Type: CWE
CWE ID: CWE-290
Description: CWE-290 Authentication Bypass by Spoofing
Metrics
VersionBase scoreBase severityVector
3.18.1HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.09.2CRITICAL
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
Version: 3.1
Base score: 8.1
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 9.2
Base severity: CRITICAL
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Adem El Adeb, vulone.com/vul1.com
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/webmin/webmin/releases/tag/2.641
release-notes
https://webmin.com/security/#webmin-prior-to-2641
release-notes
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
N/A
https://www.cve.org/CVERecord?id=CVE-2026-56020
vdb-entry
Hyperlink: https://github.com/webmin/webmin/releases/tag/2.641
Resource:
release-notes
Hyperlink: https://webmin.com/security/#webmin-prior-to-2641
Resource:
release-notes
Hyperlink: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
Resource: N/A
Hyperlink: https://www.cve.org/CVERecord?id=CVE-2026-56020
Resource:
vdb-entry
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found