Vulnerability-Lookup

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 CISA root

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	CPE status
Webmin	Webmin	Affected: *	guessed

Date Public

2026-06-18 00:00

Credits

Adem El Adeb, vulone.com/vul1.com

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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                "id": "CVE-2026-56021",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-24T19:54:17.406725Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
        },
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      }
    ],
    "cna": {
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          "defaultStatus": "unknown",
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          "vendor": "Webmin",
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                },
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              "timestamp": "2026-05-29T20:05:32.308076Z",
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            },
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          }
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      ],
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        },
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    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-09-15",
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    "vulnrichment": {
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FKIE_CVE-2026-56021

Vulnerability from fkie_nvd - Published: 2026-06-18 17:16 - Updated: 2026-08-11 12:17

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Summary

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

References

URL	Tags
9119a7d8-5eab-497f-8521-727c672e3725	https://github.com/webmin/webmin/releases/tag/2.641	Product, Release Notes
9119a7d8-5eab-497f-8521-727c672e3725	https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json	VDB Entry
9119a7d8-5eab-497f-8521-727c672e3725	https://webmin.com/security/#webmin-prior-to-2641	Vendor Advisory
9119a7d8-5eab-497f-8521-727c672e3725	https://www.cve.org/CVERecord?id=CVE-2026-56021	VDB Entry

Impacted products

	Vendor	Product	Version
	webmin	webmin	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Webmin",
          "vendor": "Webmin",
          "versions": [
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  ],
  "configurations": [
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              "versionEndExcluding": "1.290",
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          ],
          "negate": false,
          "operator": "OR"
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  ],
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  "lastModified": "2026-08-11T12:17:50.273",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
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          "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"
        },
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        "impactScore": 1.4,
        "source": "9119a7d8-5eab-497f-8521-727c672e3725",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
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          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
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          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
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          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "LOW",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "9119a7d8-5eab-497f-8521-727c672e3725",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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    },
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://webmin.com/security/#webmin-prior-to-2641"
    },
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "VDB Entry"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-56021"
    }
  ],
  "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-185"
        },
        {
          "lang": "en",
          "value": "CWE-777"
        }
      ],
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "type": "Secondary"
    }
  ]
}

GHSA-XPVH-GV3P-W5QX

Vulnerability from github – Published: 2026-06-18 18:35 – Updated: 2026-06-18 18:35

Details

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

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-56021"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-185"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-18T17:16:35Z",
    "severity": "MODERATE"
  },
  "details": "Webmin allows unauthenticated attackers to read the contents of any file ending in .conf within module directories, due to a bypassable regex pattern.",
  "id": "GHSA-xpvh-gv3p-w5qx",
  "modified": "2026-06-18T18:35:24Z",
  "published": "2026-06-18T18:35:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56021"
    },
    {
      "type": "WEB",
      "url": "https://github.com/webmin/webmin/releases/tag/2.641"
    },
    {
      "type": "WEB",
      "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-169-02.json"
    },
    {
      "type": "WEB",
      "url": "https://webmin.com/security/#webmin-prior-to-2641"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-56021"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

VA-26-169-02

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

Summary

Webmin multiple vulnerabilities

Scope

3 vulnerabilities in this advisory, including CVE-2026-56021.

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

Known affected: 1 product

Open the full advisory

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

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

FKIE_CVE-2026-56021

GHSA-XPVH-GV3P-W5QX

VA-26-169-02

Tags

Sightings

Nomenclature

Related by attack behaviour