NCSC-2026-0056

Vulnerability from csaf_ncscnl - Published: 2026-02-10 19:07 - Updated: 2026-02-10 19:07
Summary
Kwetsbaarheden verholpen in Microsoft Developer Tools

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
Microsoft heeft kwetsbaarheden verholpen in diverse componenten van Visual Studio en .NET.
Interpretaties
Een kwaadwillende kan de kwetsbaarheden misbruiken om beveiligingsmaatregelen te omzeilen, zich verhoogde rechten toe te kennen en mogelijk willekeurige code uit te voeren met rechten van het slachtoffer. Voor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden om malafide code te downloaden en uit te voeren. Omdat ontwikkelaars in ontwikkelomgevingen vaak met verhoogde rechten werken, is niet uit te sluiten dat de uitvoer van code ook plaatsvindt onder verhoogde rechten. ``` GitHub Copilot and Visual Studio: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-21523 | 8.00 | Uitvoeren van willekeurige code | | CVE-2026-21257 | 8.00 | Verkrijgen van verhoogde rechten | | CVE-2026-21256 | 8.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| GitHub Copilot and Visual Studio Code: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-21518 | 6.50 | Omzeilen van beveiligingsmaatregel | |----------------|------|-------------------------------------| .NET and Visual Studio: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-21218 | 7.50 | Voordoen als andere gebruiker | |----------------|------|-------------------------------------| Github Copilot: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2026-21516 | 8.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------|
Oplossingen
Microsoft heeft updates beschikbaar gesteld waarmee de beschreven kwetsbaarheden worden verholpen. We raden u aan om deze updates te installeren. Meer informatie over de kwetsbaarheden, de installatie van de updates en eventuele work-arounds vindt u op: https://portal.msrc.microsoft.com/en-us/security-guidance
Kans
medium
Schade
high
CWE-77
Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-94
Improper Control of Generation of Code ('Code Injection')
CWE-166
Improper Handling of Missing Special Element
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition
To clipboard 

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        "text": "Een kwaadwillende kan de kwetsbaarheden misbruiken om beveiligingsmaatregelen te omzeilen, zich verhoogde rechten toe te kennen en mogelijk willekeurige code uit te voeren met rechten van het slachtoffer.\n\nVoor succesvol misbruik moet de kwaadwillende het slachtoffer misleiden om malafide code te downloaden en uit te voeren. Omdat ontwikkelaars in ontwikkelomgevingen vaak met verhoogde rechten werken, is niet uit te sluiten dat de uitvoer van code ook plaatsvindt onder verhoogde rechten.\n\n```\nGitHub Copilot and Visual Studio: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-21523 | 8.00 | Uitvoeren van willekeurige code     | \n| CVE-2026-21257 | 8.00 | Verkrijgen van verhoogde rechten    | \n| CVE-2026-21256 | 8.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\nGitHub Copilot and Visual Studio Code: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-21518 | 6.50 | Omzeilen van beveiligingsmaatregel  | \n|----------------|------|-------------------------------------|\n\n.NET and Visual Studio: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-21218 | 7.50 | Voordoen als andere gebruiker       | \n|----------------|------|-------------------------------------|\n\nGithub Copilot: \n|----------------|------|-------------------------------------|\n| CVE-ID         | CVSS | Impact                              |\n|----------------|------|-------------------------------------|\n| CVE-2026-21516 | 8.80 | Uitvoeren van willekeurige code     | \n|----------------|------|-------------------------------------|\n\n",
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        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
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          "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
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            "CSAFPID-13",
            "CSAFPID-14",
            "CSAFPID-15",
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        "name": "Improper Handling of Missing Special Element"
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      },
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          "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
          "title": "CWE-77"
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        }
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          "CSAFPID-14",
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          "CSAFPID-16"
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          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21257.json"
        }
      ],
      "scores": [
        {
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
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            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12",
            "CSAFPID-13",
            "CSAFPID-14",
            "CSAFPID-15",
            "CSAFPID-16"
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      ],
      "title": "CVE-2026-21257"
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      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
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          "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
          "title": "CWE-77"
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        {
          "category": "other",
          "text": "Improper Control of Generation of Code (\u0027Code Injection\u0027)",
          "title": "CWE-94"
        },
        {
          "category": "description",
          "text": "A command injection vulnerability in GitHub Copilot and Visual Studio allows unauthorized attackers to execute code over a network due to improper handling of special command elements.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12",
          "CSAFPID-13",
          "CSAFPID-14",
          "CSAFPID-15",
          "CSAFPID-16"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-21256 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21256.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12",
            "CSAFPID-13",
            "CSAFPID-14",
            "CSAFPID-15",
            "CSAFPID-16"
          ]
        }
      ],
      "title": "CVE-2026-21256"
    },
    {
      "cve": "CVE-2026-21516",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
          "category": "other",
          "text": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
          "title": "CWE-77"
        },
        {
          "category": "description",
          "text": "The document outlines a vulnerability in Github Copilot that allows unauthorized code execution due to improper handling of special elements in commands.",
          "title": "Summary"
        }
      ],
      "product_status": {
        "known_affected": [
          "CSAFPID-1",
          "CSAFPID-2",
          "CSAFPID-3",
          "CSAFPID-4",
          "CSAFPID-5",
          "CSAFPID-6",
          "CSAFPID-7",
          "CSAFPID-8",
          "CSAFPID-9",
          "CSAFPID-10",
          "CSAFPID-11",
          "CSAFPID-12",
          "CSAFPID-13",
          "CSAFPID-14",
          "CSAFPID-15",
          "CSAFPID-16"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-21516 | NCSC-NL Website",
          "url": "https://vulnerabilities.ncsc.nl/csaf/v2/2026/cve-2026-21516.json"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-1",
            "CSAFPID-2",
            "CSAFPID-3",
            "CSAFPID-4",
            "CSAFPID-5",
            "CSAFPID-6",
            "CSAFPID-7",
            "CSAFPID-8",
            "CSAFPID-9",
            "CSAFPID-10",
            "CSAFPID-11",
            "CSAFPID-12",
            "CSAFPID-13",
            "CSAFPID-14",
            "CSAFPID-15",
            "CSAFPID-16"
          ]
        }
      ],
      "title": "CVE-2026-21516"
    }
  ]
}


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Tags
Taxonomy of the tags.




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.