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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.

    Published:Feb 10, 2026
    Last Modified:Apr 15, 2026
    EPS:Feb 10, 2026
    EPSS Score:0.00035
    CVSS Score:8

    Affected Products

    Vendor
    Microsoft
    Product
    Visual Studio Code
    Vendor
    Microsoft
    Product
    Visual Studio Code Copilot Chat Extension

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-81381 (CVSS 6.5) — Insufficiently protected credentials in GitHub Copilot and Visual Studio Code allows an unauthorized attacker …
    CVE-2026-81380 (CVSS 5.3) — Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visu…
    CVE-2026-81379 (CVSS 8.2) — Not failing securely ('failing open') in Visual Studio Code allows an unauthorized attacker to bypass a securi…
    CVE-2026-81378 (CVSS 8.2) — Interpretation conflict in Visual Studio Code allows an unauthorized attacker to bypass a security feature ove…
    CVE-2026-81377 (CVSS 6.5) — Improper limitation of a pathname to a restricted directory ('path traversal') in Visual Studio Code allows an…
    CVE-2026-81376 (CVSS 9.6) — Incomplete comparison with missing factors in Visual Studio Code allows an unauthorized attacker to bypass a s…
    CVE-2026-81357 (CVSS 8.2) — Server-side request forgery (ssrf) in Visual Studio Code allows an unauthorized attacker to bypass a security …
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High