CVE-2026-21521

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-21521
Improper neutralization of escape, meta, or control sequences in Copilot allows an unauthorized attacker to disclose information over a network.

7.4 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 4.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521 Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:microsoft:365_word_copilot:-:*:*:*:*:*:*:*
History

02 Feb 2026, 13:30

Type Values Removed Values Added
CPE cpe:2.3:a:microsoft:365_word_copilot:-:*:*:*:*:*:*:*
References () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521 - () https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21521 - Vendor Advisory
First Time Microsoft
Microsoft 365 Word Copilot

22 Jan 2026, 23:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-22 23:15

Updated : 2026-02-02 13:30

NVD link : CVE-2026-21521

Mitre link : CVE-2026-21521

CVE.ORG link : CVE-2026-21521

JSON object : View

Products Affected

microsoft

  • 365_word_copilot
CWE
CWE-150

Improper Neutralization of Escape, Meta, or Control Sequences