{
  "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-2026-103620",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-103620",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-10-06T18:56:41.101Z",
    "updatedAt": "2026-10-07T16:32:08.448Z",
    "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": "Missing authorization in GitHub Enterprise Server allowed repository writers to replace default branches via GraphQL",
      "summary": "A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program.",
      "affected": [
        {
          "vendor": "GitHub",
          "product": "Enterprise Server",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "3.18.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.18.*",
              "changes": [
                {
                  "at": "3.18.16",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.19.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.19.*",
              "changes": [
                {
                  "at": "3.19.13",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.20.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.20.*",
              "changes": [
                {
                  "at": "3.20.9",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.21.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.21.*",
              "changes": [
                {
                  "at": "3.21.7",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.22.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.22.*",
              "changes": [
                {
                  "at": "3.22.2",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  }
}