CVE-2026-56020

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Source
https://cve.org/CVERecord?id=CVE-2026-56020
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56020.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-56020
Published
2026-06-18T16:12:05Z
Modified
2026-10-28T02:30:26Z
Severity
  • 9.2 (Critical) CVSS_V4 - 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 CVSS Calculator
Summary
Webmin HTTP header authentication bypass
Details

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.

Database specific 
{
    "cna_assigner": "cisa-cg",
    "cwe_ids": [
        "CWE-290"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56020.json"
}
References

Affected packages

Git / github.com/webmin/webmin

Affected ranges

Type
GIT
Repo
https://github.com/webmin/webmin
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
25321b467b2945d14de06781f10a98ca381a1e23
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "2.202"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "original_tag": "2.202",
            "range": [
                {
                    "fixed": "25321b467b2945d14de06781f10a98ca381a1e23"
                }
            ],
            "source": "REFERENCES_TAG"
        },
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "2.202"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

1.*
1.700
1.710
1.720
1.730
1.740
1.750
1.760
1.770
1.780
1.790
1.800
1.801
1.810
1.820
1.830
1.831
1.840
1.850
1.860
1.870
1.880
1.890
1.900
1.910
1.920
1.930
1.940
1.941
1.950
1.951
1.953
1.954
1.955
1.960
1.962
1.970
1.972
1.973
1.974
1.980
1.982
1.983
1.984
1.990
1.991
1.993
1.994
1.995
1.996
1.998
1.999
2.*
2.000
2.001
2.003
2.010
2.011
2.012
2.013
2.020
2.021
2.100
2.103
2.104
2.105
2.110
2.111
2.200
2.201

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56020.json"