What is CVE-2026-50517?

CVE-2026-50517 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft M365 Copilot Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-50517 cover?

CVE-2026-50517 covers the following CVE IDs: CVE-2026-50517. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-50517?

CVE-2026-50517 has a CVSS v3 base score of 9.9, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-50517?

CVE-2026-50517 affects 1 product, including: Microsoft 365 Copilot.

CVE-2026-50517CriticalCVSS 9.9

Microsoft M365 Copilot Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 23, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-50517 →

📋 Description

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

🎯 Affected products1

Microsoft 365 Copilot

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50517