{
  "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-2026-77987",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-77987",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-22T20:43:53.715Z",
    "updatedAt": "2026-09-23T15:26:58.923Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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": "GitHub Enterprise Server notebook viewer vulnerable to Server-side request forgery",
      "summary": "A server-side request forgery (SSRF) vulnerability was identified in the notebook viewer of GitHub Enterprise Server. The notebook viewer validated the scheme and host of a user-supplied URL but did not validate the port, allowing requests to be directed to internal services listening on other ports of the same appliance. Response bodies were not returned to the requester, but response timing acted as an oracle that allowed instance secrets to be extracted character by character. An extracted secret could then be used in a separate interaction with an internal service to obtain remote code execution on the appliance. Exploitation required network access to the instance and was unauthenticated when private mode was disabled, or required any authenticated user when private mode was enabled. This vulnerability affected GitHub Enterprise Server versions 3.17 through 3.22 and was fixed in versions 3.22.1, 3.21.6, 3.20.8, 3.19.12, 3.18.15, and 3.17.21. This vulnerability was reported through the GitHub Bug Bounty program.",
      "affected": [
        {
          "vendor": "GitHub",
          "product": "Enterprise Server",
          "defaultStatus": "unknown",
          "versions": [
            {
              "version": "3.17.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.17.*",
              "changes": [
                {
                  "at": "3.17.21",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.18.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.18.*",
              "changes": [
                {
                  "at": "3.18.15",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.19.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.19.*",
              "changes": [
                {
                  "at": "3.19.12",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.20.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.20.*",
              "changes": [
                {
                  "at": "3.20.8",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.21.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.21.*",
              "changes": [
                {
                  "at": "3.21.6",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.22.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.22.*",
              "changes": [
                {
                  "at": "3.22.1",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  }
}