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CVE-2026-21523

HighCVSS 8.0/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.0/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Microsoft Visual Studio Code CoPilot Chat Extension	>= 0.27.0, < 0.37.1
Microsoft	Visual Studio Code	>= 1.0.0, < 1.110.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523Vendor Advisory

Timeline

Published: Feb 10, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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CVE-2026-21523: High severity, CVSS 8.0 | Vulnix