CVE-2026-21523

8.0 HIGH

Published: February 10, 2026 Modified: February 11, 2026

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.

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

0.0 Low Medium High Critical 10.0

Vector String

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Patch Vendor Advisory Exploit Third Party Advisory

Source: secure@microsoft.com

Vendor Advisory

1 reference(s) from NVD

CVSS v3 Score

8.0 / 10.0

EPSS (Exploit Probability)

0.0%

8th percentile

Exploitation Status

Not in CISA KEV

CWE-367

microsoft