Jul 2026: Microsoft M365 Copilot Remote Code Execution Vulnerability
CVE-2026-50517 Published on July 24, 2026
Microsoft M365 Copilot Remote Code Execution Vulnerability
Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-50517 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2026-50517
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Affected Versions
Microsoft 365 Copilot Version - is affected by CVE-2026-50517Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.