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CVE-2026-55946 Details

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:5.9 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55946	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-77	Improper Neutralization of Special Elements used in a Command ('Command Injection')	[email protected]

Affected Products

Product	Versions
microsoft copilot	All versions
CPE cpe:2.3:a:microsoft:copilot:-:::::::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Sep 25, 2026	Initial Analysis	[email protected]
Sep 21, 2026	CVE Modified	CISA-ADP
Sep 19, 2026	CVE Modified	CISA-ADP
Sep 18, 2026	CVE Modified	CISA-ADP
Sep 17, 2026	New CVE Received	[email protected]