{
  "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-2026-4296",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-4296",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-21T22:12:45.356Z",
    "updatedAt": "2026-04-22T13:16:53.004Z",
    "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": "Incorrect Regular Expression vulnerability in GitHub Enterprise Server allowed unauthorized access to user accounts via OAuth callback URL validation bypass",
      "summary": "An incorrect regular expression vulnerability was identified in GitHub Enterprise Server that allowed an attacker to bypass OAuth redirect URI validation. An attacker with knowledge of a first-party OAuth application's registered callback URL could craft a malicious authorization link that, when clicked by a victim, would redirect the OAuth authorization code to an attacker-controlled domain. This could allow the attacker to gain unauthorized access to the victim's account with the scopes granted to the OAuth application. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.",
      "affected": [
        {
          "vendor": "GitHub",
          "product": "Enterprise Server",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.14.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.14.25",
              "changes": [
                {
                  "at": "3.14.26",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.15.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.15.20",
              "changes": [
                {
                  "at": "3.15.21",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.16.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.16.16",
              "changes": [
                {
                  "at": "3.16.17",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.17.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.17.13",
              "changes": [
                {
                  "at": "3.17.14",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.18.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.18.7",
              "changes": [
                {
                  "at": "3.18.8",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.19.0",
              "status": "affected",
              "versionType": "semver",
              "lessThanOrEqual": "3.19.4",
              "changes": [
                {
                  "at": "3.19.5",
                  "status": "unaffected"
                }
              ]
            },
            {
              "version": "3.20.0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.20.1",
              "changes": [
                {
                  "at": "3.20.1",
                  "status": "unaffected"
                }
              ]
            }
          ]
        }
      ]
    }
  }
}