High 8.1Published Jun 18, 2026

CVE-2026-56020Webmin HTTP header authentication bypass

Updated under an hour ago (Oct 27, 2026, 7:23 AM ET)

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It affects Webmin. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 2.202.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-290
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: cisa-cg
NVD analysis: Awaiting Analysis
Record last updated: Aug 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Webmin Webmin webmin:webmin (from the name)	before 2.202; 2.202 not affected	CNA record

References

References

https://github.com/webmin/webmin/releases/tag/2.202	release-notes
https://webmin.com/security/#webmin-prior-to-2202	release-notes
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json
https://www.cve.org/CVERecord?id=CVE-2026-56020	vdb-entry

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.