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CVE-2026-21523

GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability

HIGH
8
CVSS Score
Published: February 10, 2026 at 05:51 PM UTC
Updated: June 17, 2026 at 10:18 AM UTC
2 products affected across 1 vendorVisual Studio CodeGitHub Copilot Chat

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Severity
HIGH8
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Visual Studio Code· Microsoft
95%
v < 1.109.21.0.0 ≤ v < 1.110.11.0.0
Affected range stops below 1.110.1, so it looks safe — our inference, not a vendor statement
GitHub Copilot Chat· Microsoft
60%
0.27.0 ≤ v < 0.37.10.27.0
Affected range stops below 0.37.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-367

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