{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Amol Dosanjh, Dre Cura (@dre_cura), and Nicholas Zubrisky (@NZubrisky) of TrendAI Research of Trend with https://www.zerodayinitiative.com/"
        ]
      },
      {
        "names": [
          "\u003ca href=\"https://www.linkedin.com/in/huseyintintas\"\u003eH\u0026#252;seyin TINTA\u015e\u003c/a\u003e with Kredi Kay\u0131t B\u0026#252;rosu"
        ]
      },
      {
        "names": [
          "Suryakant Dhakane"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-21518 GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21518"
      },
      {
        "category": "self",
        "summary": "CVE-2026-21518 GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-21518.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability",
    "tracking": {
      "current_release_date": "2026-04-01T07:00:00.000Z",
      "generator": {
        "date": "2026-04-02T00:05:17.423Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-21518",
      "initial_release_date": "2026-02-10T08:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-02-10T08:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2026-02-27T08:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Download links fixed"
        },
        {
          "date": "2026-04-01T07:00:00.000Z",
          "legacy_version": "2",
          "number": "3",
          "summary": "To comprehensively address the vulnerability, Microsoft has released a new security update for Visual Studio Code. Microsoft reccomends installing version 1.110.1 to be protected from this vulnerability."
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c1.110.1",
            "product": {
              "name": "Visual Studio Code \u003c1.110.1",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "1.110.1",
            "product": {
              "name": "Visual Studio Code 1.110.1",
              "product_id": "11622"
            }
          }
        ],
        "category": "product_name",
        "name": "Visual Studio Code"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c0.37.1",
            "product": {
              "name": "Microsoft Visual Studio Code CoPilot Chat Extension \u003c0.37.1",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "0.37.1",
            "product": {
              "name": "Microsoft Visual Studio Code CoPilot Chat Extension 0.37.1",
              "product_id": "16782"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft Visual Studio Code CoPilot Chat Extension"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-21518",
      "cwe": {
        "id": "CWE-77",
        "name": "Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "The authentication feature could be bypassed as this vulnerability allows impersonation.",
          "title": "What kind of security feature could be bypassed by successfully exploiting this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11622",
          "16782"
        ],
        "known_affected": [
          "1",
          "2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-21518 GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21518"
        },
        {
          "category": "self",
          "summary": "CVE-2026-21518 GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-21518.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-02-10T08:00:00.000Z",
          "details": "1.110.1:Security Update:https://code.visualstudio.com/updates/v1_110",
          "product_ids": [
            "2"
          ],
          "url": "https://code.visualstudio.com/updates/v1_110"
        },
        {
          "category": "vendor_fix",
          "date": "2026-02-10T08:00:00.000Z",
          "details": "0.37.1:Security Update:https://github.com/microsoft/vscode/",
          "product_ids": [
            "1"
          ],
          "url": "https://github.com/microsoft/vscode/"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 7.7,
            "userInteraction": "REQUIRED",
            "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": [
            "1",
            "2"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Security Feature Bypass"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "GitHub Copilot and Visual Studio Code Security Feature Bypass Vulnerability"
    }
  ]
}