Sep 2026: M365 Copilot Information Disclosure Vulnerability
CVE-2026-85887 Published on September 17, 2026
M365 Copilot Information Disclosure Vulnerability
Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.
Weakness Type
Incorrect Permission Assignment for Critical Resource
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. When a resource is given a permissions setting that provides access to a wider range of actors than required, it could lead to the exposure of sensitive information, or the modification of that resource by unintended parties. This is especially dangerous when the resource is related to program configuration, execution or sensitive user data.
Products Associated with CVE-2026-85887
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