Vulnerability-Lookup

GHSA-28FV-VPXC-GMP4

Vulnerability from github – Published: 2026-04-22 00:31 – Updated: 2026-04-22 00:31

Details

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.

Severity ?

5.3 (Medium)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-5512"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-21T23:16:22Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-28fv-vpxc-gmp4",
  "modified": "2026-04-22T00:31:42Z",
  "published": "2026-04-22T00:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5512"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-5512 (GCVE-0-2026-5512)

Vulnerability from cvelistv5 – Published: 2026-04-21 22:12 – Updated: 2026-04-22 17:39

Title

Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API

Summary

Severity ?

5.3 (Medium)


                        
                          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

CWE

CWE-201 - Insertion of sensitive information into sent data

Assigner

GitHub_P

References

URL

Tags

	https://docs.github.com/en/enterprise-server@3.14…
	https://docs.github.com/en/enterprise-server@3.15…
	https://docs.github.com/en/enterprise-server@3.16…
	https://docs.github.com/en/enterprise-server@3.17…
	https://docs.github.com/en/enterprise-server@3.18…
	https://docs.github.com/en/enterprise-server@3.19…
	https://docs.github.com/en/enterprise-server@3.20…

Impacted products

	Vendor	Product	Version
	GitHub	Enterprise Server	Affected: 3.14.0 , ≤ 3.14.25 (semver) Affected: 3.15.0 , ≤ 3.15.20 (semver) Affected: 3.16.0 , ≤ 3.16.16 (semver) Affected: 3.17.0 , ≤ 3.17.13 (semver) Affected: 3.18.0 , ≤ 3.18.7 (semver) Affected: 3.19.0 , ≤ 3.19.4 (semver) Affected: 3.20.0 , < 3.20.1 (semver)

Credits

ahacker1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-5512",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:38:49.635439Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T17:39:01.520Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "product": "Enterprise Server",
          "vendor": "GitHub",
          "versions": [
            {
              "changes": [
                {
                  "at": "3.14.26",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.14.25",
              "status": "affected",
              "version": "3.14.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.15.21",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.15.20",
              "status": "affected",
              "version": "3.15.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.16.17",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.16.16",
              "status": "affected",
              "version": "3.16.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.17.14",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.17.13",
              "status": "affected",
              "version": "3.17.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.18.8",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.18.7",
              "status": "affected",
              "version": "3.18.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.19.5",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.19.4",
              "status": "affected",
              "version": "3.19.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.20.1",
                  "status": "unaffected"
                }
              ],
              "lessThan": "3.20.1",
              "status": "affected",
              "version": "3.20.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "ahacker1"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "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.\u003cbr\u003e"
            }
          ],
          "value": "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."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-113",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-113 Interface Manipulation"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "CWE-201 Insertion of sensitive information into sent data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-21T22:14:01.033Z",
        "orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
        "shortName": "GitHub_P"
      },
      "references": [
        {
          "url": "https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5"
        },
        {
          "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API",
      "x_generator": {
        "engine": "Vulnogram 1.0.1"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
    "assignerShortName": "GitHub_P",
    "cveId": "CVE-2026-5512",
    "datePublished": "2026-04-21T22:12:58.344Z",
    "dateReserved": "2026-04-03T18:21:52.907Z",
    "dateUpdated": "2026-04-22T17:39:01.520Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-28FV-VPXC-GMP4

CVE-2026-5512 (GCVE-0-2026-5512)

Tags

Sightings

Nomenclature