Microsoft Copilot Tampering Vulnerability

Date Jun 9, 2026

Type Patch Tuesday

Signal High-risk advisory

Vendor / Product Microsoft · Microsoft Copilot

CVE CVE-2026-42895

High-risk advisory CVE-2026-42895

Summary

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network. Published in June 2026 Security Updates. MSRC exploitability: Publicly Disclosed:No;Exploited:No;Latest Software Release:N/A.

Why it matters

Microsoft published this item through its Security Update Guide, making it part of Patch Tuesday triage for affected Windows, cloud, or application estates. EPSS percentile: 30%.

Operator check

Review the Microsoft Security Update Guide entry for CVE-2026-42895. Confirm whether Microsoft Copilot is deployed, then apply the current security update or documented mitigation. CVSS score: 6.5. EPSS probability: 0.4%; percentile: 30%.

Sources

MSRC 2026-Jun Security Update Guide NVD — CVE-2026-42895

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