Out-of-bounds Read in Windows Win32K Affects Microsoft Systems
CVE-2026-56176

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Office 365 For Mac
Microsoft Office For Android
Microsoft Office Ltsc For Mac 2021
Microsoft Office Ltsc For Mac 2024
Vendor
CVE Published:
14 July 2026

What is CVE-2026-56176?

A vulnerability exists in Windows Win32K that allows an authorized attacker to execute an out-of-bounds read, leading to potential local privilege escalation. By exploiting this flaw, attackers may gain unauthorized access to sensitive system resources. It is crucial for users to apply the latest patches provided by Microsoft to mitigate the risks associated with this vulnerability.

Affected Version(s)

Microsoft Office 365 for Mac 1.0.0 < 16.111.26071215

Microsoft Office for Android 16.0.1 < 16.0.20228.20042

Microsoft Office LTSC for Mac 2021 16.0.1 < 16.111.26071215

References

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

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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