CVE-2026-21523HIGH 8.0EPSS p51.5%

CVE-2026-21523CVE-2026-21523

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.

Scoring

CVSS 3.18.0 (HIGH)
VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS0.79% probability of exploitation · percentile 51.5% · 2026-06-18T12:00:27Z
Published2026-02-10
Last modified2026-02-11

Underlying weaknesses· 1

CWE-367

References

  1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523

1

TypeTargetConfidenceTier
WeaknessTime-of-check Time-of-use (TOCTOU) Race Conditioncwe-3670%live

Related by meaning· 6

Nearest entities by semantic similarity across the cs-graph corpus.

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.