NCSC-2026-0067

Vulnerability from csaf_ncscnl - Published: 2026-02-20 10:13 - Updated: 2026-02-20 10:13
Summary
Kwetsbaarheden verholpen in GitHub Enterprise Server

Notes

The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions: NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein. NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory. This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings.
Feiten
GitHub heeft kwetsbaarheden verholpen in GitHub Enterprise Server (Specifiek voor versies vóór 3.20, 3.19.2, 3.18.5 en 3.17.11).
Interpretaties
De eerste kwetsbaarheid betreft een autorisatieprobleem dat het mogelijk maakte voor aanvallers om ongeautoriseerde pull-requests samen te voegen in repositories die fork-ondersteuning bieden. De tweede kwetsbaarheid betreft een ontbrekende autorisatie die aanvallers in staat stelde om ongeautoriseerde inhoud te uploaden naar de migratie-export van een andere gebruiker. Beide kwetsbaarheden zijn opgelost in de genoemde versies.
Oplossingen
GitHub heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.
Kans
medium
Schade
high
CWE-862
Missing Authorization
CWE-863
Incorrect Authorization
To clipboard 

{
  "document": {
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE"
      }
    },
    "lang": "nl",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this page to enhance access to its information and security advisories. The use of this security advisory is subject to the following terms and conditions:\n\n    NCSC-NL makes every reasonable effort to ensure that the content of this page is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or continuous keeping up-to-date. The information contained in this security advisory is intended solely for the purpose of providing general information to professional users. No rights can be derived from the information provided therein.\n\n    NCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of this security advisory. This includes damage resulting from the inaccuracy of incompleteness of the information contained in the advisory.\n    This security advisory is subject to Dutch law. All disputes related to or arising from the use of this advisory will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings."
      },
      {
        "category": "description",
        "text": "GitHub heeft kwetsbaarheden verholpen in GitHub Enterprise Server (Specifiek voor versies v\u00f3\u00f3r 3.20, 3.19.2, 3.18.5 en 3.17.11).",
        "title": "Feiten"
      },
      {
        "category": "description",
        "text": "De eerste kwetsbaarheid betreft een autorisatieprobleem dat het mogelijk maakte voor aanvallers om ongeautoriseerde pull-requests samen te voegen in repositories die fork-ondersteuning bieden. De tweede kwetsbaarheid betreft een ontbrekende autorisatie die aanvallers in staat stelde om ongeautoriseerde inhoud te uploaden naar de migratie-export van een andere gebruiker. Beide kwetsbaarheden zijn opgelost in de genoemde versies.",
        "title": "Interpretaties"
      },
      {
        "category": "description",
        "text": "GitHub heeft updates uitgebracht om de kwetsbaarheden te verhelpen. Zie bijgevoegde referenties voor meer informatie.",
        "title": "Oplossingen"
      },
      {
        "category": "general",
        "text": "medium",
        "title": "Kans"
      },
      {
        "category": "general",
        "text": "high",
        "title": "Schade"
      },
      {
        "category": "general",
        "text": "Missing Authorization",
        "title": "CWE-862"
      },
      {
        "category": "general",
        "text": "Incorrect Authorization",
        "title": "CWE-863"
      }
    ],
    "publisher": {
      "category": "coordinator",
      "contact_details": "cert@ncsc.nl",
      "name": "Nationaal Cyber Security Centrum",
      "namespace": "https://www.ncsc.nl/"
    },
    "references": [
      {
        "category": "external",
        "summary": "Reference",
        "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.2"
      }
    ],
    "title": "Kwetsbaarheden verholpen in GitHub Enterprise Server",
    "tracking": {
      "current_release_date": "2026-02-20T10:13:39.540778Z",
      "generator": {
        "date": "2025-08-04T16:30:00Z",
        "engine": {
          "name": "V.A.",
          "version": "1.3"
        }
      },
      "id": "NCSC-2026-0067",
      "initial_release_date": "2026-02-20T10:13:39.540778Z",
      "revision_history": [
        {
          "date": "2026-02-20T10:13:39.540778Z",
          "number": "1.0.0",
          "summary": "Initiele versie"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-1"
                }
              }
            ],
            "category": "product_name",
            "name": "Enterprise Server"
          }
        ],
        "category": "vendor",
        "name": "GitHub"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "vers:unknown/*",
                "product": {
                  "name": "vers:unknown/*",
                  "product_id": "CSAFPID-2"
                }
              }
            ],
            "category": "product_name",
            "name": "GitHub Enterprise"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-1999",
      "cwe": {
        "id": "CWE-863",
        "name": "Incorrect Authorization"
      },
      "notes": [
        {
          "category": "other",
          "text": "Incorrect Authorization",
          "title": "CWE-863"
        },
        {
          "category": "description",
          "text": "An authorization vulnerability in GitHub Enterprise Server prior to versions 3.19.2, 3.18.5, and 3.17.11 allowed unauthorized pull requests to be merged into repositories, resolved through the GitHub Bug Bounty program.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:L/SI:H/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",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-1999 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-1999.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2"
          ]
        }
      ],
      "title": "CVE-2026-1999"
    },
    {
      "cve": "CVE-2026-1355",
      "cwe": {
        "id": "CWE-862",
        "name": "Missing Authorization"
      },
      "notes": [
        {
          "category": "other",
          "text": "Missing Authorization",
          "title": "CWE-862"
        },
        {
          "category": "description",
          "text": "A Missing Authorization vulnerability in GitHub Enterprise Server prior to version 3.20 allowed unauthorized content uploads to user repository migration exports, which was addressed in later updates.",
          "title": "Summary"
        },
        {
          "category": "general",
          "text": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:L/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",
          "title": "CVSSV4"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-1355 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-1355.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2"
          ]
        }
      ],
      "title": "CVE-2026-1355"
    }
  ]
}


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  • 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.
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