CVE-2026-69556

Microsoft Office Word Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 3, 2026

Description

Heap-based buffer overflow in Microsoft Office Word 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-122 Heap-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 16.113.26091433Affected
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 16.113.26091433Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.113.26091433Affected
Microsoft Word 2016Microsoft	16.0.1 to before 16.0.5569.1002Affected

References

Microsoft Office Word Remote Code Execution Vulnerabilityvendor-advisorypatch

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