CVE-2026-21523 GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
An authorized attacker can execute code via a race condition in GitHub Copilot and Visual Studio Code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21523?
CVE-2026-21523 is a high-severity vulnerability in Microsoft Visual Studio Code, published on 10 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-367
Which versions are affected by CVE-2026-21523?
It affects 1 product.
Products include Microsoft Visual Studio Code.
How do I fix CVE-2026-21523?
No fix has been published for CVE-2026-21523 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21523 being exploited?
There is no known exploitation of CVE-2026-21523 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Visual Studio Code
- CVE-2026-81376 Visual Studio Code Security Feature Bypass Vulnerability
- CVE-2026-47281 Visual Studio Code Elevation of Privilege Vulnerability
- CVE-2026-78462 Visual Studio Code Security Feature Bypass Vulnerability
- CVE-2026-59113 Visual Studio Code Remote Code Execution Vulnerability
- CVE-2026-69320 Visual Studio Code Remote Code Execution Vulnerability