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Microsoft Security Response CenterCVE-2026-55145

Outlook Copilot Tampering Vulnerability

Improper neutralization of special elements used in a command ('command injection') in Outlook Copilot allows an authorized attacker to perform tampering over a network.

Read the vendor bulletin Get alerts for Microsoft Copilot
6.3CVSS out of 10Medium severity
Scope

What the vendor says is affected

  • Microsoft Copilot
Timeline

When this advisory changed

  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.

Vulnerabilities

CVEs named in this advisory

CVE-2026-55145View CVSS, KEV, EPSS, and threat context
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