CVE-2026-78501

Microsoft · Published September 17, 2026

7.4

CVSS v3.1

HIGH

Patch availableGet patch

Description

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.

Affected Products

Microsoft 365 Copilot's Business Chat

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C