CVE-2026-83891

Microsoft Office Word Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Aug 31, 2026

Description

Stack-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-121 Stack-based Buffer Overflow
CWE-20 Improper Input Validation

Affected Products

Product	Versions
Microsoft 365 Apps for EnterpriseMicrosoft	16.0.1 to before https://aka.ms/OfficeSecurityReleasesAffected
Microsoft Office 365 for MacMicrosoft	1.0.0 to before 16.114.26101123Affected
Microsoft Office LTSC 2021Microsoft	16.0.1 to before 16.0.14334.20974Affected
Microsoft Office LTSC 2024Microsoft	16.0.0 to before 16.0.17932.21056Affected
Microsoft Office LTSC for Mac 2021Microsoft	16.0.1 to before 16.114.26101123Affected
Microsoft Office LTSC for Mac 2024Microsoft	16.0.0 to before 16.114.26101123Affected

References

Microsoft Office Word Remote Code Execution Vulnerabilityvendor-advisorypatch

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