Buffer Over-read Vulnerability in Microsoft Office Word by Microsoft
CVE-2026-83951

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:
8 September 2026

What is CVE-2026-83951?

A buffer over-read vulnerability in Microsoft Office Word could allow an unauthorized attacker to disclose sensitive information locally. Attackers exploiting this vulnerability could access data that should remain secure, posing risks to user privacy and data integrity. It is crucial for users to apply the necessary patches and updates to safeguard their systems against potential leaks of confidential information.

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:
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

.