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
2026-06-18T16:12:05.368Z
Modified
2026-07-08T08:13:46.164291567Z
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 2.641.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56020.json",
    "cna_assigner": "cisa-cg",
    "cwe_ids": [
        "CWE-290"
    ]
}
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
ce1ab74c6fe6a7c5f776ba8e62ec0fcf812414c9
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.641"
        }
    ]
}

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
2.202
2.301
2.302
2.400
2.401
2.402
2.501
2.510
2.520
2.600
2.610
2.620
2.621
2.630
2.640

Database specific

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