CVE-2026-21521 HIGH

CVE-2026-21521: Word Copilot Information Disclosure Vulnerability

Vendor Microsoft
Product Microsoft 365 Word Copilot
Weakness CWE-150
Published January 22, 2026
Last update April 1, 2026
View on NVD All CVEs

CVSS base score

7.4/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality High
Integrity None

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

What the vulnerability does

01Description

Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.

Key dates

02Disclosure timeline

January 22, 2026 CVE published
April 1, 2026 Record updated