Vulnerability-Lookup

CVE-2026-9132 (GCVE-0-2026-9132)

Vulnerability from cvelistv5 – Published: 2026-06-30 20:23 – Updated: 2026-07-01 15:37

Title

Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository contents via the Copilot pull request diff summary endpoint

Summary

A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. This vulnerability was reported via the GitHub Bug Bounty program.

Severity

6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 15:37 UTC

CWE

CWE-862 - Missing Authorization

Assigner

GitHub_P CNA under the mitre root

CNA scorecard B 84/100 over 22 records in the last 180 days details

References

4 references

URL	Tags
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

1 product

Vendor	Product	Version	CPE status
GitHub	Enterprise Server	Affected: 3.17.0 , ≤ 3.17.16 (semver) Affected: 3.18.0 , ≤ 3.18.10 (semver) Affected: 3.19.0 , ≤ 3.19.7 (semver) Affected: 3.20.0 , ≤ 3.20.3 (semver)	guessed

Credits

Seokchan Yoon

Show details on NVD website

JSON

To clipboard

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                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-862",
                  "description": "CWE-862 Missing Authorization",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-30T20:23:37.445Z",
            "orgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
            "shortName": "GitHub_P"
          },
          "references": [
            {
              "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17-features"
            },
            {
              "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11-features"
            },
            {
              "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8-features"
            },
            {
              "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4-features"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository contents via the Copilot pull request diff summary endpoint",
          "x_generator": {
            "engine": "Vulnogram 1.0.2"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "82327ea3-741d-41e4-88f8-2cf9e791e760",
        "assignerShortName": "GitHub_P",
        "cveId": "CVE-2026-9132",
        "datePublished": "2026-06-30T20:23:37.445Z",
        "dateReserved": "2026-05-20T18:18:07.930Z",
        "dateUpdated": "2026-07-01T15:37:50.129Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-9132

Vulnerability from fkie_nvd - Published: 2026-06-30 21:16 - Updated: 2026-10-25 21:10

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17-features	Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11-features	Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8-features	Release Notes
product-cna@github.com	https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4-features	Release Notes

Impacted products

Vendor	Product	Version
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	*
github	enterprise_server	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Enterprise Server",
          "vendor": "GitHub",
          "versions": [
            {
              "changes": [
                {
                  "at": "3.17.17",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.17.16",
              "status": "affected",
              "version": "3.17.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.18.11",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.18.10",
              "status": "affected",
              "version": "3.18.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.19.8",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.19.7",
              "status": "affected",
              "version": "3.19.0",
              "versionType": "semver"
            },
            {
              "changes": [
                {
                  "at": "3.20.4",
                  "status": "unaffected"
                }
              ],
              "lessThanOrEqual": "3.20.3",
              "status": "affected",
              "version": "3.20.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "product-cna@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2EBDB435-5723-482A-8F7F-9A8987D76B4A",
              "versionEndExcluding": "3.17.17",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "0553891C-ED0B-4D2C-A832-29996F0CE8B2",
              "versionEndExcluding": "3.18.11",
              "versionStartIncluding": "3.18.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E67B4A61-E777-4B50-8DFC-DDF6292C4771",
              "versionEndExcluding": "3.19.8",
              "versionStartIncluding": "3.19.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A51E85E4-FF55-497C-A39F-F69E224E63BD",
              "versionEndExcluding": "3.20.4",
              "versionStartIncluding": "3.20.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The\n   Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view\n   the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all\n   versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. This vulnerability was reported via the GitHub Bug Bounty program."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de autorizaci\u00f3n faltante fue identificada en GitHub Enterprise Server que permit\u00eda a un usuario autenticado leer c\u00f3digo fuente de repositorios privados a los que no ten\u00eda acceso. El endpoint de resumen de diferencias de la descripci\u00f3n de solicitudes de extracci\u00f3n de Copilot aceptaba un rango de comparaci\u00f3n entre repositorios y renderizaba la diferencia resultante sin verificar que el usuario solicitante estuviera autorizado para ver el repositorio de destino. La explotaci\u00f3n requer\u00eda una cuenta autenticada en la instancia con acceso de lectura a al menos un repositorio para usar como base de comparaci\u00f3n. Esta vulnerabilidad afectaba a todas las versiones de GitHub Enterprise Server anteriores a la 3.21 y fue corregida en las versiones 3.17.17, 3.18.11, 3.19.8 y 3.20.4. Esta vulnerabilidad fue reportada a trav\u00e9s del programa de recompensas por errores de GitHub."
    }
  ],
  "id": "CVE-2026-9132",
  "lastModified": "2026-10-25T21:10:00.770",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.0,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "product-cna@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-9132",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-01T15:37:41.106015Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-06-30T21:16:30.960",
  "references": [
    {
      "source": "product-cna@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17-features"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11-features"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8-features"
    },
    {
      "source": "product-cna@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4-features"
    }
  ],
  "sourceIdentifier": "product-cna@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "product-cna@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-42PG-J2H8-H5FW

Vulnerability from github – Published: 2026-06-30 21:31 – Updated: 2026-07-02 18:36

Details

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

6.0 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-9132"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-30T21:16:30Z",
    "severity": "MODERATE"
  },
  "details": "A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The\n   Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view\n   the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all\n   versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. This vulnerability was reported via the GitHub Bug Bounty program.",
  "id": "GHSA-42pg-j2h8-h5fw",
  "modified": "2026-07-02T18:36:18Z",
  "published": "2026-06-30T21:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9132"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17-features"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11-features"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8-features"
    },
    {
      "type": "WEB",
      "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4-features"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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"
    }
  ]
}

NCSC-2026-0219

Vulnerability from csaf_ncscnl - Published: 2026-07-03 08:21 - Updated: 2026-07-03 08:21

Summary

Kwetsbaarheden verholpen in GitHub Enterprise Server

Scope

3 vulnerabilities in this advisory, including CVE-2026-9132.

CVE-2026-9132

A missing authorization vulnerability in GitHub Enterprise Server prior to version 3.21 allowed authenticated users to access private repository source code via the Copilot pull request description diff summary endpoint.

6.5 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Known affected: 2 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-9132 (GCVE-0-2026-9132)

FKIE_CVE-2026-9132

GHSA-42PG-J2H8-H5FW

NCSC-2026-0219

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour