Search threats, CVEs… ⌘K
Back to vendor advisories
Microsoft Security Response CenterCVE-2026-50517

Microsoft M365 Copilot Remote Code Execution Vulnerability

Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.

Read the vendor bulletin Get alerts for Microsoft 365 Copilot
9.9CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Microsoft 365 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-2026-50517View CVSS, KEV, EPSS, and threat context
Keep investigating
See every advisory from this vendor