CVE-2026-21523
high
Microsoft CVSS v3 Base Score
8.0
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
EPSS Score
0.0%
Exploitation probability in 30 days
Top 92% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Published: February 10, 2026 (93 days ago)
Last Modified: March 13, 2026
Vendor: Microsoft
Source: MITRE
Vulnerability Report
Generated by CyberWatcher
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.
CWE
CWE-367Affected Products
Microsoft Microsoft Visual Studio Code CoPilot Chat ExtensionMicrosoft Visual Studio Code