← Vulnerability feed

Vulnerability record · CVE-2026-21523 · published 10 February 2026

CVE-2026-21523: Microsoft visual studio code toctou race condition vulnerability

Microsoft · Visual Studio Code

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.

8.0 CVSS 3.1 High EPSS 0.81% · top 44.9% CWE-367 · TOCTOU race condition
8.0CVSS 3.1 base score
0.81%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523 Vendor Advisory

Track CVE-2026-21523 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-55319Microsoft visual studio code command injection vulnerabilityAi command injection in Agentic AI and Visual Studio Code allows an unauthorized attacker to execute code over a network.EPSS 0.92%9.8CVE-2024-43488Microsoft visual studio code missing authentication for critical function vulnerabilityMissing authentication for critical function in Visual Studio Code extension for Arduino allows an unauthenticated attacker to perform remote code ex…EPSS 1.2%9.6CVE-2026-81376Microsoft visual studio code vulnerabilityIncomplete comparison with missing factors in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.EPSS 0.82%9.6CVE-2026-47281Microsoft visual studio code missing authentication for critical function vulnerabilityMissing authorization in Visual Studio Code allows an unauthorized attacker to elevate privileges over a network.EPSS 0.76%8.8CVE-2026-78462Microsoft visual studio code insecure direct object reference vulnerabilityAuthorization bypass through user-controlled key in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.EPSS 0.76%8.8CVE-2026-70336Microsoft visual studio code code injection vulnerabilityImproper control of generation of code ('code injection') in Visual Studio Code allows an unauthorized attacker to execute code over a network.EPSS 0.82%8.8CVE-2026-69320Microsoft visual studio code os command injection vulnerabilityImproper neutralization of special elements used in an os command ('os command injection') in Visual Studio Code allows an unauthorized attacker to e…EPSS 0.86%8.8CVE-2026-59113Microsoft visual studio code missing authorization vulnerabilityMissing authorization in Visual Studio Code allows an unauthorized attacker to execute code over a network.EPSS 0.76%

Source: NIST National Vulnerability Database (record CVE-2026-21523), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.