🛡️ CVE-2026-21523 — visual-studio-code

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-367 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-21523 is classified as CWE-367: Time-of-check Time-of-use Race Condition. The state checked and the state acted upon can differ, because it may change between the two steps.

Affected software

CVE-2026-21523 is recorded against 1 package.

  • visual-studio-code (fixed in 1.109.2)

Timeline and source

Published on 10 February 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

msrc.microsoft.com

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CWE CWE-367
Public Exploit ✅ No
Source NVD
Published 2026-02-10
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
visual-studio-code — 1.109.2

Similar Threats

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