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CVE-2026-21523

Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5fc9ebb703bfca920d1b2c995a05a16bfd4f8fe667c8e724958f1e2a558def1d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"Visual Studio Code","vendor":"Microsoft","versions":[{"lessThan":"1.110.1","status":"affected","version":"1.0.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/affected/1

{"product":"Microsoft Visual Studio Code CoPilot Chat Extension","vendor":"Microsoft","versions":[{"lessThan":"0.37.1","status":"affected","version":"0.27.0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"Visual Studio Code","vendor":"Microsoft","versions":[{"lessThan":"1.110.1","status":"affected","version":"1.0.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/affected/1
{"product":"Microsoft Visual Studio Code CoPilot Chat Extension","vendor":"Microsoft","versions":[{"lessThan":"0.37.1","status":"affected","version":"0.27.0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":8,"baseSeverity":"HIGH","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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-367","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en-US","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion
{"name":"GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability","tags":["vendor-advisory","patch"],"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a7a7d56f9cba45ba66374a1704f0d485643a27caf2f20135cb3258ecacb07cce · sha256:c7e9123d32fb3c30… · /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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