{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-4266",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-4266",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-03-30T12:38:01.593Z",
    "updatedAt": "2026-08-27T22:58:27.131Z",
    "importedAt": "2026-10-24T01:58:14.884Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "WatchGuard Firebox Insecure Deserialization in Fireware Access Portal",
      "summary": "An Insecure Deserialization vulnerability in WatchGuard Fireware OS allows an attacker that has obtained write access to the local filesystem through another vulnerability to execute arbitrary code in the context of the portald user.\n\nNote, this vulnerability does not affect Firebox platforms that do not support the Access Portal feature, including the T15 and T35.",
      "affected": [
        {
          "vendor": "WatchGuard",
          "product": "Fireware OS",
          "platforms": [
            "Default"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2025.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "2026.2"
            },
            {
              "version": "12.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "12.12"
            }
          ]
        },
        {
          "vendor": "WatchGuard",
          "product": "Fireware OS",
          "platforms": [
            "EUCC"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "12.1",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "12.11.9"
            }
          ]
        }
      ]
    }
  }
}