CVE-2026-24307 CRITICAL

CVE-2026-24307: M365 Copilot Information Disclosure Vulnerability

Vendor Microsoft

Product Microsoft 365 Copilot

Weakness CWE-1287

Published January 22, 2026

Last update April 1, 2026

CVSS base score

9.3/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction Required

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

01Description

Improper validation of specified type of input in M365 Copilot allows an unauthorized attacker to disclose information over a network.

Key dates

January 22, 2026 CVE published

April 1, 2026 Record updated

External resources

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