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Microsoft Security Response CenterCVE-2026-41090

Microsoft Copilot Tampering Vulnerability

CriticalVendor CVSS 9.3 / 10 1 CVE Published May 21, 2026 at 7:00 AM UTC

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.

Products covered

  • Microsoft 365 Copilot for iOS

Remediation

Separate remediation guidance was not included in the collected bulletin.

CVEs in this advisory 1

Updates

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.