Out-of-Bounds Read Vulnerability in Microsoft Office Word
CVE-2026-78522

6.5MEDIUM

Key Information:

Vendor

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

What is CVE-2026-78522?

An out-of-bounds read vulnerability in Microsoft Office Word can be exploited by unauthorized attackers, leading to the potential disclosure of sensitive information over a network. This security flaw allows malicious actors to access data that should be protected, highlighting the importance of timely updates and patches for safeguarding against such risks. Organizations using Microsoft Office Word should stay informed and apply necessary security measures to mitigate this threat.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1 < 16.0.20326.20138

Microsoft Office 2019 32-bit Systems 19.0.0 < 16.0.10417.20207

Microsoft Office LTSC 2021 32-bit Systems 16.0.1 < 16.0.14334.20906

References

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

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.