CVE-2026-45497Network attack vector

Authenticated code execution via undisclosed command injection

Published Jun 4, 2026 · Updated Jun 4, 2026

Command injection in Microsoft 365 Copilot allows remote authenticated users to execute code through the hosted service. Microsoft identifies improper neutralization of command elements but does not disclose the affected component, input path, or command construction operation. Exploitation requires an authorized account, needs no user interaction, and can affect data confidentiality, integrity, and service availability.

CVSS severity7.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Microsoft 365 Copilot allows remote authenticated users to execute code through the hosted service. Microsoft identifies improper neutralization of command elements but does not disclose the affected component, input path, or command construction operation. Exploitation requires an authorized account, needs no user interaction, and can affect data confidentiality, integrity, and service availability.

The record

CVE
CVE-2026-45497
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Microsoft
Product
Microsoft 365 Copilot
Classifications
CWE-77, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=-

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft 365 Copilotversion=-

Published CVSS scores

7.7MicrosoftCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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