CVE-2026-26129

Microsoft · Published May 7, 2026

7.5

CVSS v3.1

HIGH

Patch availableGet patch

Description

M365 Copilot Information Disclosure Vulnerability. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot 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:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C