Information Disclosure Vulnerability in Microsoft Office Word by Microsoft
CVE-2026-63521

5.5MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office Ltsc 2021
Microsoft Office Ltsc 2024
Vendor
CVE Published:
11 August 2026

What is CVE-2026-63521?

An out-of-bounds read vulnerability in Microsoft Office Word could allow an unauthorized attacker to access sensitive information stored locally on a user's system. This flaw presents a severe risk as it exposes users to potential data breaches and unauthorized access of confidential information, making it crucial for users to apply available patches to mitigate such threats.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office LTSC 2021 32-bit Systems 16.0.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.