CVE-2026-24299: M365 Copilot Information Disclosure Vulnerability

Overview

Severity
Medium (CVSS 5.3)
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
Category
Information Disclosure
Exploit Status
Not Exploited
Patch Tuesday
2026-Mar
Released
2026-03-19

Description

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

FAQ

Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.

Affected Products (1)

Apps

  • Microsoft 365 Copilot

Acknowledgments

<a href="https://twitter.com/wunderwuzzi23">Johann Rehberger</a> with https://embracethered.com/

Revision History

  • 2026-03-19: Information published.