Vulnerability · Published Feb 10, 2026 · Assigned by microsoft
CVE-2026-21523GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability
High 8.0
In plain English
A high-severity security flaw in Microsoft Visual Studio Code CoPilot Chat Extension from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 56% of all known vulnerabilities).
Severity (CVSS 3.1)8.0High
Exploit odds (30 days)0.8%top 44.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Visual Studio Code CoPilot Chat Extension | 0.27.0 – before 0.37.1 |
| Microsoft | Visual Studio Code | 1.0.0 – before 1.110.1 |
Weakness: CWE-367 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability vendor-advisory, patch