Proxy configuration command injection vulnerability found in GitHub Enterprise Server Management Console configuration API_CVE-2026-4821

{
    "lastseen": "",
    "description": "An improper neutralization of special elements vulnerability was identified in GitHub Enterprise Server that allowed an authenticated Management Console administrator\u00a0to execute arbitrary OS commands\u00a0via\u00a0shell metacharacter injection in proxy configuration fields such as\u00a0http_proxy.\u00a0Exploitation of this vulnerability required access to the GitHub Enterprise Server instance and administrator privileges to the Management Console. 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.",
    "published": "2026-04-21T22:12:26.772Z",
    "modified": "2026-04-21T22:12:26.772Z",
    "type": "cve",
    "title": "Proxy configuration command injection vulnerability found in GitHub Enterprise Server Management Console configuration API",
    "source": "GitHub_P",
    "references": "https://docs.github.com/en/[email protected]/admin/release-notes#3.20.1\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.19.5\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.18.8\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.17.14\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.16.17\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.15.21\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.14.24",
    "id": "CVE-2026-4821",
    "bulletinFamily": "",
    "cwe": [
        "CWE-78"
    ],
    "cvelist": null,
    "sourceData": "GitHub Enterprise Server 3.20.0\nGitHub Enterprise Server 3.19.0\nGitHub Enterprise Server 3.18.0\nGitHub Enterprise Server 3.17.0\nGitHub Enterprise Server 3.16.0\nGitHub Enterprise Server 3.15.0\nGitHub Enterprise Server 3.14.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.1,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Enterprise Server",
    "version": "3.20.0",
    "vendor": "GitHub",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
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    "ai_score": 0
}