CVE-2026-66807

Microsoft Office Graphics Component Remote Code Execution Vulnerability

State: Published
Severity: 7.8 High
Published: Aug 11, 2026
Updated: Oct 30, 2026
Reserved: Jul 27, 2026

Description

Stack-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/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 365 Apps for EnterpriseMicrosoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 2019Microsoft	19.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.112.26081010Affected
Microsoft Office LTSC 2021Microsoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.112.26081010Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.112.26081010Affected

References

Microsoft Office Graphics Component Remote Code Execution Vulnerabilityvendor-advisorypatch

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