PT-2026-7406 · Microsoft+1 · Visual Studio Code+2

Alexander Tan · CVE-2026-21523 · Published 2026-02-10 · Updated 2026-05-29

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions GitHub Copilot and Visual Studio (affected versions not specified) Visual Studio Code (affected versions not specified)

Description A time-of-check time-of-use (TOCTOU) race condition exists in GitHub Copilot and Visual Studio. This condition arises from synchronization errors when using a shared resource, specifically a race condition. Successful exploitation could allow a remote attacker to execute code.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Time Of Check To Time Of Use

Command Injection

Weakness Enumeration

CWE-367

CWE-77

Related Identifiers

BDU:2026-01789

CVE-2026-21523

Affected Products

Github Copilot

Visual Studio

Visual Studio Code

References · 6

• https://bdu.fstec.ru/vul/2026-01789 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-21523 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21523 · Security Note
• https://t.me/msrcreports/3250 · Telegram Post
• https://twitter.com/threadlinqs/status/2060329582482305331 · Twitter Post