{
  "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-2026-100803",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-100803",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-29T12:36:20.195Z",
    "updatedAt": "2026-10-01T15:16:27.751Z",
    "importedAt": "2026-10-24T01:57:50.502Z",
    "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": "Same-origin policy bypass in the WebExtensions component",
      "summary": "Same-origin policy bypass in the WebExtensions component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.",
      "affected": [
        {
          "vendor": "Mozilla",
          "product": "Firefox",
          "versions": [
            {
              "version": "115.42",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "115.*"
            },
            {
              "version": "140.17",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "140.*"
            },
            {
              "version": "153.4",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "153.*"
            },
            {
              "version": "157",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "*"
            }
          ]
        },
        {
          "vendor": "Mozilla",
          "product": "Thunderbird",
          "versions": [
            {
              "version": "140.17",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "140.*"
            },
            {
              "version": "153.4",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "153.*"
            },
            {
              "version": "157",
              "status": "unaffected",
              "versionType": "rpm",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}