Sep 2026: Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability
CVE-2026-78501 Published on September 17, 2026
Microsoft 365 Copilot Business Chat Information Disclosure Vulnerability
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.
Weakness Types
What is a Command Injection Vulnerability?
The software 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.
CVE-2026-78501 has been classified to as a Command Injection vulnerability or weakness.
Improper Restriction of Communication Channel to Intended Endpoints
The software 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.
Products Associated with CVE-2026-78501
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