CVE-2026-21523: GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
Microsoft · Microsoft Visual Studio Code CoPilot Chat Extension
Vendor fix available · Affected: Microsoft Visual Studio Code CoPilot Chat Extension · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 55% of scored CVEs
DescriptionCVE.org
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.
Affected products2
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · Microsoft Visual Studio Code CoPilot Chat Extensionfrom 0.27.0 before 0.37.1
- Microsoft · Visual Studio Codefrom 1.0.0 before 1.110.1
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-21523 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.