CVE-2026-78439

Microsoft Office Graphics Component Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 24, 2026

Description

Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-121 Stack-based Buffer Overflow

Affected Products

Product	Versions
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.113.26091433Affected
Microsoft Office for AndroidMicrosoft	16.0.1 to before 16.0.20430.20000Affected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.113.26091433Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.113.26091433Affected

References

Microsoft Office Graphics Component Remote Code Execution Vulnerabilityvendor-advisorypatch

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