Buffer Overflow in Microsoft Graphics Component Affects Software Security
CVE-2026-78439

8.8HIGH

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:
8 September 2026

What is CVE-2026-78439?

A stack-based buffer overflow vulnerability in Microsoft Graphics Component could allow an attacker to execute arbitrary code remotely. By exploiting this flaw, unauthorized users may gain control over the affected system, leading to potential data breaches or further exploitation. Mitigation through timely updates and patches is crucial to protect systems against this type of attack.

Affected Version(s)

Microsoft Office 365 for Mac -

Microsoft Office for Android 16.0.1 < 16.0.20430.20000

Microsoft Office LTSC for Mac 2021 -

References

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

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.