Vulnerability-Lookup

VA-26-169-02

Vulnerability from csaf_cisa - Published: 2026-06-18 15:56 - Updated: 2026-08-11 15:32

Summary

Webmin multiple vulnerabilities

Notes

Legal Notice: All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).

Countries and Areas Deployed: Worldwide

Critical Infrastructure Sectors: Information Technology

Risk Evaluation: Webmin contains multiple vulnerabilities. In the worst case, a remote, unauthenticated attacker could impersonate and authenticate as any user.

Recommended Practices: Update to most recent available version of Webmin.

Company Headquarters Location: United States

CVE-2026-56020

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-290 - Authentication Bypass by Spoofing

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Webmin Webmin <2.202 Webmin / Webmin		<2.202	Vendor Fix

Fixed 1 product

Product	Identifier	Version	Remediation
Webmin Webmin 2.202 Webmin / Webmin		2.202	Vendor Fix

CVE-2026-56021

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-185 - Incorrect Regular Expression

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Webmin Webmin vers:all/* Webmin / Webmin		vers:all/*	No Fix Planned

CVE-2026-56022

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE-308 - Use of Single-factor Authentication

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Webmin Webmin <2.640 Webmin / Webmin		<2.640	Vendor Fix

Fixed 1 product

Product	Identifier	Version	Remediation
Webmin Webmin 2.640 Webmin / Webmin		2.640	Vendor Fix

References

9 references

URL	Category
https://raw.githubusercontent.com/cisagov/CSAF/de…	self
https://github.com/webmin/webmin/releases/tag/2.202	external
https://webmin.com/security/#webmin-prior-to-2202	external
https://raw.githubusercontent.com/cisagov/CSAF/de…	external
https://www.cve.org/CVERecord?id=CVE-2026-56020	external
https://www.cve.org/CVERecord?id=CVE-2026-56021	external
https://webmin.com/security/#webmin-prior-to-2640	external
https://github.com/webmin/webmin/releases/tag/2.640	external
https://www.cve.org/CVERecord?id=CVE-2026-56022	external

Acknowledgments

vulone.com/vul1.com Adem El Adeb

JSON

To clipboard

{
  "document": {
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \\\"as is\\\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).",
        "title": "Legal Notice"
      },
      {
        "category": "other",
        "text": "Worldwide",
        "title": "Countries and Areas Deployed"
      },
      {
        "category": "other",
        "text": "Information Technology",
        "title": "Critical Infrastructure Sectors"
      },
      {
        "category": "summary",
        "text": "Webmin contains multiple vulnerabilities. In the worst case, a remote, unauthenticated attacker could impersonate and authenticate as any user.",
        "title": "Risk Evaluation"
      },
      {
        "category": "general",
        "text": "Update to most recent available version of Webmin.",
        "title": "Recommended Practices"
      },
      {
        "category": "other",
        "text": "United States",
        "title": "Company Headquarters Location"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "https://www.cisa.gov/report",
      "issuing_authority": "CISA",
      "name": "CISA",
      "namespace": "https://www.cisa.gov/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Vulnerability Advisory VA-26-169-02 CSAF",
        "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
      }
    ],
    "title": "Webmin multiple vulnerabilities",
    "tracking": {
      "current_release_date": "2026-08-11T15:32:46Z",
      "generator": {
        "engine": {
          "name": "VINCE-NT",
          "version": "1.15.0+build.101"
        }
      },
      "id": "VA-26-169-02",
      "initial_release_date": "2026-06-18T15:56:50Z",
      "revision_history": [
        {
          "date": "2026-08-11T15:32:46Z",
          "number": "2.0.0",
          "summary": "Content Update"
        },
        {
          "date": "2026-06-18T15:56:50Z",
          "number": "1.0.0",
          "summary": "Initial publication"
        }
      ],
      "status": "final",
      "version": "2.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "vers:all/*",
                "product": {
                  "name": "Webmin Webmin vers:all/*",
                  "product_id": "CSAFPID-0001"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.640",
                "product": {
                  "name": "Webmin Webmin \u003c2.640",
                  "product_id": "CSAFPID-0002"
                }
              },
              {
                "category": "product_version",
                "name": "2.640",
                "product": {
                  "name": "Webmin Webmin 2.640",
                  "product_id": "CSAFPID-0003"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.202",
                "product": {
                  "name": "Webmin Webmin \u003c2.202",
                  "product_id": "CSAFPID-0004"
                }
              },
              {
                "category": "product_version",
                "name": "2.202",
                "product": {
                  "name": "Webmin Webmin 2.202",
                  "product_id": "CSAFPID-0005"
                }
              }
            ],
            "category": "product_name",
            "name": "Webmin"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "vers:all/*",
                "product": {
                  "name": "Webmin Webmin vers:all/*",
                  "product_id": "CSAFPID-0006"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.640",
                "product": {
                  "name": "Webmin Webmin \u003c2.640",
                  "product_id": "CSAFPID-0007"
                }
              },
              {
                "category": "product_version",
                "name": "2.640",
                "product": {
                  "name": "Webmin Webmin 2.640",
                  "product_id": "CSAFPID-0008"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.202",
                "product": {
                  "name": "Webmin Webmin \u003c2.202",
                  "product_id": "CSAFPID-0009"
                }
              },
              {
                "category": "product_version",
                "name": "2.202",
                "product": {
                  "name": "Webmin Webmin 2.202",
                  "product_id": "CSAFPID-0010"
                }
              }
            ],
            "category": "product_name",
            "name": "Webmin"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "vers:all/*",
                "product": {
                  "name": "Webmin Webmin vers:all/*",
                  "product_id": "CSAFPID-0011"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.640",
                "product": {
                  "name": "Webmin Webmin \u003c2.640",
                  "product_id": "CSAFPID-0012"
                }
              },
              {
                "category": "product_version",
                "name": "2.640",
                "product": {
                  "name": "Webmin Webmin 2.640",
                  "product_id": "CSAFPID-0013"
                }
              },
              {
                "category": "product_version_range",
                "name": "\u003c2.202",
                "product": {
                  "name": "Webmin Webmin \u003c2.202",
                  "product_id": "CSAFPID-0014"
                }
              },
              {
                "category": "product_version",
                "name": "2.202",
                "product": {
                  "name": "Webmin Webmin 2.202",
                  "product_id": "CSAFPID-0015"
                }
              }
            ],
            "category": "product_name",
            "name": "Webmin"
          }
        ],
        "category": "vendor",
        "name": "Webmin"
      }
    ]
  },
  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Adem El Adeb"
          ],
          "organization": "vulone.com/vul1.com"
        }
      ],
      "cve": "CVE-2026-56020",
      "cwe": {
        "id": "CWE-290",
        "name": "Authentication Bypass by Spoofing"
      },
      "notes": [
        {
          "category": "summary",
          "text": "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.",
          "title": "Description"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:N/T:T/2026-05-29T20:04:47Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-0005"
        ],
        "known_affected": [
          "CSAFPID-0004"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/webmin/webmin/releases/tag/2.202"
        },
        {
          "category": "external",
          "summary": "webmin.com",
          "url": "https://webmin.com/security/#webmin-prior-to-2202"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56020"
        }
      ],
      "release_date": "2026-06-18T00:00:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in 2.202.",
          "product_ids": [
            "CSAFPID-0004"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in 2.202.",
          "product_ids": [
            "CSAFPID-0005"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0004"
          ]
        }
      ],
      "title": "Webmin HTTP header authentication bypass"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Adem El Adeb"
          ],
          "organization": "vulone.com/vul1.com"
        }
      ],
      "cve": "CVE-2026-56021",
      "cwe": {
        "id": "CWE-185",
        "name": "Incorrect Regular Expression"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.",
          "title": "Description"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:N/T:P/2026-05-29T20:05:32Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-0001"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56021"
        }
      ],
      "release_date": "2026-06-18T00:00:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "details": "No fix planned.",
          "product_ids": [
            "CSAFPID-0001"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0001"
          ]
        }
      ],
      "title": "Webmin information disclosure via regex pattern"
    },
    {
      "acknowledgments": [
        {
          "names": [
            "Adem El Adeb"
          ],
          "organization": "vulone.com/vul1.com"
        }
      ],
      "cve": "CVE-2026-56022",
      "cwe": {
        "id": "CWE-308",
        "name": "Use of Single-factor Authentication"
      },
      "notes": [
        {
          "category": "summary",
          "text": "Webmin accepts basic authentication without session cookies when an attacker provides the \u0027User-Agent: webmin\u0027 header, allowing bypass of additional MFA requirements. Fixed in 2.640.",
          "title": "Description"
        },
        {
          "category": "details",
          "text": "SSVCv2/E:N/A:N/T:P/2026-05-29T20:06:09Z/",
          "title": "SSVC"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-0003"
        ],
        "known_affected": [
          "CSAFPID-0002"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "webmin.com",
          "url": "https://webmin.com/security/#webmin-prior-to-2640"
        },
        {
          "category": "external",
          "summary": "github.com",
          "url": "https://github.com/webmin/webmin/releases/tag/2.640"
        },
        {
          "category": "external",
          "summary": "raw.githubusercontent.com",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "category": "external",
          "summary": "www.cve.org",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56022"
        }
      ],
      "release_date": "2026-06-18T00:00:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Fixed in 2.640.",
          "product_ids": [
            "CSAFPID-0002"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Fixed in 2.640.",
          "product_ids": [
            "CSAFPID-0003"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-0002"
          ]
        }
      ],
      "title": "Webmin MFA bypass"
    }
  ]
}

CVE-2026-56020 (GCVE-0-2026-56020)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:12 – Updated: 2026-08-11 15:33

Title

Webmin HTTP header authentication bypass

Summary

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.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

9.2 (Critical)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · cisa-cg (v2.0.3)

Decision recorded 2026-05-29 20:04 UTC

CWE

CWE-290 - Authentication Bypass by Spoofing

Assigner

cisa-cg

References

4 references

URL	Tags
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/de…
https://www.cve.org/CVERecord?id=CVE-2026-56020	vdb-entry

Impacted products

1 product

Vendor	Product	Version
Webmin	Webmin	Affected: 0 , < 2.202 (custom) Unaffected: 2.202

Date Public

2026-06-18 00:00

Credits

Adem El Adeb, vulone.com/vul1.com

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56020",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-19T03:55:50.732526Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-22T12:33:00.797Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Webmin",
          "vendor": "Webmin",
          "versions": [
            {
              "lessThan": "2.202",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "2.202"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Adem El Adeb, vulone.com/vul1.com"
        }
      ],
      "datePublic": "2026-06-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 9.2,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          }
        },
        {
          "other": {
            "content": {
              "id": "CVE-2026-56020",
              "options": [
                {
                  "Exploitation": "none"
                },
                {
                  "Automatable": "no"
                },
                {
                  "Technical Impact": "total"
                }
              ],
              "role": "CISA Coordinator",
              "timestamp": "2026-05-29T20:04:47.266910Z",
              "version": "2.0.3"
            },
            "type": "ssvc"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290 Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-11T15:33:27.670Z",
        "orgId": "9119a7d8-5eab-497f-8521-727c672e3725",
        "shortName": "cisa-cg"
      },
      "references": [
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/webmin/webmin/releases/tag/2.202"
        },
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://webmin.com/security/#webmin-prior-to-2202"
        },
        {
          "name": "url",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "name": "url",
          "tags": [
            "vdb-entry"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56020"
        }
      ],
      "title": "Webmin HTTP header authentication bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
    "assignerShortName": "cisa-cg",
    "cveId": "CVE-2026-56020",
    "datePublished": "2026-06-18T16:12:05.368Z",
    "dateReserved": "2026-06-18T14:15:27.103Z",
    "dateUpdated": "2026-08-11T15:33:27.670Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-56021 (GCVE-0-2026-56021)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:11 – Updated: 2026-06-24 19:54

Title

Webmin information disclosure via regex pattern

Summary

Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · cisa-cg (v2.0.3)

Decision recorded 2026-05-29 20:05 UTC

CWE

CWE-185 - Incorrect Regular Expression
CWE-777 - Regular Expression without Anchors

Assigner

cisa-cg

References

4 references

URL	Tags
https://webmin.com/security/#webmin-prior-to-2641	release-notes
https://github.com/webmin/webmin/releases/tag/2.641	release-notes
https://raw.githubusercontent.com/cisagov/CSAF/de…
https://www.cve.org/CVERecord?id=CVE-2026-56021	vdb-entry

Impacted products

1 product

Vendor	Product	Version
Webmin	Webmin	Affected: *

Date Public

2026-06-18 00:00

Credits

Adem El Adeb, vulone.com/vul1.com

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56021",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-24T19:54:17.406725Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-24T19:54:23.848Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Webmin",
          "vendor": "Webmin",
          "versions": [
            {
              "status": "affected",
              "version": "*"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Adem El Adeb, vulone.com/vul1.com"
        }
      ],
      "datePublic": "2026-06-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE"
          }
        },
        {
          "other": {
            "content": {
              "id": "CVE-2026-56021",
              "options": [
                {
                  "Exploitation": "none"
                },
                {
                  "Automatable": "no"
                },
                {
                  "Technical Impact": "partial"
                }
              ],
              "role": "CISA Coordinator",
              "timestamp": "2026-05-29T20:05:32.308076Z",
              "version": "2.0.3"
            },
            "type": "ssvc"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-185",
              "description": "CWE-185 Incorrect Regular Expression",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-777",
              "description": "CWE-777 Regular Expression without Anchors",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-18T16:11:46.310Z",
        "orgId": "9119a7d8-5eab-497f-8521-727c672e3725",
        "shortName": "cisa-cg"
      },
      "references": [
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://webmin.com/security/#webmin-prior-to-2641"
        },
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/webmin/webmin/releases/tag/2.641"
        },
        {
          "name": "url",
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "name": "url",
          "tags": [
            "vdb-entry"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56021"
        }
      ],
      "title": "Webmin information disclosure via regex pattern"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
    "assignerShortName": "cisa-cg",
    "cveId": "CVE-2026-56021",
    "datePublished": "2026-06-18T16:11:46.310Z",
    "dateReserved": "2026-06-18T14:15:35.109Z",
    "dateUpdated": "2026-06-24T19:54:23.848Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-56022 (GCVE-0-2026-56022)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:11 – Updated: 2026-08-11 15:33

Title

Webmin MFA bypass

Summary

Webmin accepts basic authentication without session cookies when an attacker provides the 'User-Agent: webmin' header, allowing bypass of additional MFA requirements. Fixed in 2.640.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · cisa-cg (v2.0.3)

Decision recorded 2026-05-29 20:06 UTC

CWE

CWE-308 - Use of Single-factor Authentication

Assigner

cisa-cg

References

4 references

URL	Tags
https://webmin.com/security/#webmin-prior-to-2640	release-notes
https://github.com/webmin/webmin/releases/tag/2.640	release-notes
https://raw.githubusercontent.com/cisagov/CSAF/de…	third-party-advisory
https://www.cve.org/CVERecord?id=CVE-2026-56022	vdb-entry

Impacted products

1 product

Vendor	Product	Version
Webmin	Webmin	Affected: 0 , < 2.640 (custom) Unaffected: 2.640

Date Public

2026-06-18 00:00

Credits

Adem El Adeb, vulone.com/vul1.com

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56022",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-24T19:54:55.353387Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-24T19:55:03.365Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Webmin",
          "vendor": "Webmin",
          "versions": [
            {
              "lessThan": "2.640",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "2.640"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Adem El Adeb, vulone.com/vul1.com"
        }
      ],
      "datePublic": "2026-06-18T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Webmin accepts basic authentication without session cookies when an attacker provides the \u0027User-Agent: webmin\u0027 header, allowing bypass of additional MFA requirements. Fixed in 2.640."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        },
        {
          "other": {
            "content": {
              "id": "CVE-2026-56022",
              "options": [
                {
                  "Exploitation": "none"
                },
                {
                  "Automatable": "no"
                },
                {
                  "Technical Impact": "partial"
                }
              ],
              "role": "CISA Coordinator",
              "timestamp": "2026-05-29T20:06:09.689996Z",
              "version": "2.0.3"
            },
            "type": "ssvc"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-308",
              "description": "CWE-308 Use of Single-factor Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-11T15:33:46.054Z",
        "orgId": "9119a7d8-5eab-497f-8521-727c672e3725",
        "shortName": "cisa-cg"
      },
      "references": [
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://webmin.com/security/#webmin-prior-to-2640"
        },
        {
          "name": "url",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/webmin/webmin/releases/tag/2.640"
        },
        {
          "name": "url",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
        },
        {
          "name": "url",
          "tags": [
            "vdb-entry"
          ],
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56022"
        }
      ],
      "title": "Webmin MFA bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "9119a7d8-5eab-497f-8521-727c672e3725",
    "assignerShortName": "cisa-cg",
    "cveId": "CVE-2026-56022",
    "datePublished": "2026-06-18T16:11:22.057Z",
    "dateReserved": "2026-06-18T14:15:41.670Z",
    "dateUpdated": "2026-08-11T15:33:46.054Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

VA-26-169-02

CVE-2026-56020 (GCVE-0-2026-56020)

CVE-2026-56021 (GCVE-0-2026-56021)

CVE-2026-56022 (GCVE-0-2026-56022)

Tags

Sightings

Nomenclature