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CVE-2026-83891

HighCVSS 8.8/10Last modified Oct 15, 2026

Description

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

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

Affected software

Vendor	Product	Versions
Microsoft	Microsoft 365 Apps for Enterprise	>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
Microsoft	Microsoft Office 365 for Mac	>= 1.0.0, < 16.114.26101123
Microsoft	Microsoft Office LTSC 2021	>= 16.0.1, < 16.0.14334.20974
Microsoft	Microsoft Office LTSC 2024	>= 16.0.0, < 16.0.17932.21056
Microsoft	Microsoft Office LTSC for Mac 2021	>= 16.0.1, < 16.114.26101123
Microsoft	Microsoft Office LTSC for Mac 2024	>= 16.0.0, < 16.114.26101123

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83891Vendor Advisory

Timeline

Published: Oct 13, 2026
Last modified: Oct 15, 2026
NVD status: Analyzed

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CVE-2026-83891: High severity, CVSS 8.8 | Vulnix