Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API_CVE-2026-5512

{
    "lastseen": "",
    "description": "An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. 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, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.",
    "published": "2026-04-21T22:12:58.344Z",
    "modified": "2026-04-21T22:14:01.033Z",
    "type": "cve",
    "title": "Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API",
    "source": "GitHub_P",
    "references": "https://docs.github.com/en/[email protected]/admin/release-notes#3.14.26\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.15.21\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.16.17\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.17.14\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.18.8\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.19.5\nhttps://docs.github.com/en/[email protected]/admin/release-notes#3.20.1",
    "id": "CVE-2026-5512",
    "bulletinFamily": "",
    "cwe": [
        "CWE-201"
    ],
    "cvelist": null,
    "sourceData": "GitHub Enterprise Server 3.14.0\nGitHub Enterprise Server 3.15.0\nGitHub Enterprise Server 3.16.0\nGitHub Enterprise Server 3.17.0\nGitHub Enterprise Server 3.18.0\nGitHub Enterprise Server 3.19.0\nGitHub Enterprise Server 3.20.0",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Enterprise Server",
    "version": "3.14.0",
    "vendor": "GitHub",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}