CVE-2026-78501

Published: Sep 17, 2026Modified: Oct 14, 2026

8.6

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Exploitability: 3.9 / Impact: 4.0

Source: NVD (Secondary)

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft 365 Copilot's Business Chat allows an unauthorized attacker to disclose information over a network.

Affected (1)

Products: Microsoft: 365 Copilot Chat

Microsoft

1 product

365 Copilot Chat

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Microsoft 365 Copilot Chat	All versions

Related CWEs

CWE-77

Improper Neutralization of Special Elements used in a Command ('Command Injection')

The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component.

CWE-923

Improper Restriction of Communication Channel to Intended Endpoints

The product establishes a communication channel to (or from) an endpoint for privileged or protected operations, but it does not properly ensure that it is communicating with the correct endpoint.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78501

Source: secure@microsoft.com

PatchVendor Advisory

Timeline

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