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CVE-2026-21256

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an unauthorized attacker to execute code over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:2c5d7b7027a2d189d237a74a1ff6383348c3f33a37908b286d3cae0c1c7e199b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Microsoft Visual Studio 2026 version 18.3","vendor":"Microsoft","versions":[{"lessThan":"18.3.0","status":"affected","version":"18.3.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/affected/1

{"product":"Microsoft Visual Studio 2022 version 17.14","vendor":"Microsoft","versions":[{"lessThan":"17.14.26","status":"affected","version":"17.14.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/affected/0
cwe · 2 assertions

{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en-US","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/problemTypes/0/descriptions/1

{"cweId":"CWE-77","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","lang":"en-US","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

2 source assertions
{"product":"Microsoft Visual Studio 2026 version 18.3","vendor":"Microsoft","versions":[{"lessThan":"18.3.0","status":"affected","version":"18.3.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/affected/1
{"product":"Microsoft Visual Studio 2022 version 17.14","vendor":"Microsoft","versions":[{"lessThan":"17.14.26","status":"affected","version":"17.14.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-94","description":"CWE-94: Improper Control of Generation of Code ('Code Injection')","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/problemTypes/0/descriptions/1
{"cweId":"CWE-77","description":"CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"GitHub Copilot and Visual Studio Remote Code Execution Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21256"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:7c14f8d80c6d1d91bcb4617bb30c57a486da83b381351fc3bd67e5e455730166 · sha256:fbe9a6dae6ae6f8a… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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