MSRC-CVE-2026-45497 — Microsoft M365 Copilot Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Critical. Not known to be exploited. Customer action: Not required.

Details

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability?
This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency.
Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Vulnerabilities 1

High 7.7

CVE-2026-45497

Microsoft M365 Copilot Remote Code Execution Vulnerability

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an authorized attacker to execute code over a network.

Microsoft Microsoft 365 Copilot

Jun 4, 2026

Revision history

2026-06-04 #1
Information published.

References

CVE-2026-45497 Microsoft M365 Copilot Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45497
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss