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CVE-2026-45497: Microsoft M365 Copilot Remote Code Execution Vulnerability

highCVSS 7.7CVE-2026-45497
Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an authorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: M365 CopilotRemote code execution
What
An authorized attacker can execute code over a network due to improper neutralization of special elements used in a command.
Who is affected
Users of Microsoft M365 Copilot are affected.
Urgency
Remediation is high urgency due to the potential for remote code execution and the severity of the vulnerability.
Action
Update to the latest version of M365 Copilot.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.7
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45497

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45497coverage & exploitation statusNVD · CVE.org

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