SB20260210107 - Multiple vulnerabilities in Microsoft GitHub Copilot and Visual Studio

Description

This security bulletin contains information about 4 secuirty vulnerabilities.

1) Command Injection (CVE-ID: CVE-2026-21518)

The vulnerability allows a remote attacker to execute arbitrary commands on the system.

The vulnerability exists due to insufficient input validation in GitHub Copilot and Visual Studio Code. A remote attacker can pass specially crafted data to the application and execute arbitrary commands.

2) Command Injection (CVE-ID: CVE-2026-21256)

The vulnerability allows a remote attacker to execute arbitrary commands on the system.

The vulnerability exists due to insufficient input validation in GitHub Copilot and Visual Studio. A remote attacker can pass specially crafted data to the application and execute arbitrary commands.

3) Command Injection (CVE-ID: CVE-2026-21257)

The vulnerability allows a remote attacker to execute arbitrary commands on the system.

The vulnerability exists due to insufficient input validation in GitHub Copilot and Visual Studio. A remote user can pass specially crafted data to the application and execute arbitrary commands.

4) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-21523)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition in GitHub Copilot and Visual Studio. A remote user can execute arbitrary code on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21518
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21256
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21257
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523