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Description

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.

PUBLISHED Reserved 2025-12-30 | Published 2026-02-10 | Updated 2026-02-23 | Assigner microsoft




HIGH: 8.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

Product status

1.0.0 (custom) before 1.109.2
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523 (GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability) vendor-advisory patch

cve.org (CVE-2026-21523)

nvd.nist.gov (CVE-2026-21523)

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