CVE-2026-69285: Microsoft Office Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

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

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Sep

Released

2026-09-08

EPSS Score

0.57% (percentile: 45.1%)

Description

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

FAQ

Is the Preview Pane an attack vector for this vulnerability? Yes, the Preview Pane is an attack vector. According to the CVSS metric, the attack vector is network (AV:N) and user interaction is required (UI:R). What is the target context of the remote code execution? This attack requires a user to open a specially crafted file from the attacker to initiate remote code execution.

Affected Products (10)

Microsoft Office

• Microsoft Office 2019 for 32-bit editions
• Microsoft Office 2019 for 64-bit editions
• Microsoft 365 Apps for Enterprise for 32-bit Systems
• Microsoft 365 Apps for Enterprise for 64-bit Systems
• Microsoft Office LTSC 2021 for 64-bit editions
• Microsoft Office LTSC 2021 for 32-bit editions
• Microsoft Office LTSC 2024 for 32-bit editions
• Microsoft Office LTSC 2024 for 64-bit editions
• Microsoft Office 2016 (32-bit edition)
• Microsoft Office 2016 (64-bit edition)

Security Updates (1)

• 5002916

Acknowledgments

<a href="https://www.linkedin.com/in/haaeein">Haein Lee</a> with KAIST Hacking Lab, <a href="https://x.com/lmksecurity">Jeongmin Choi</a>

Revision History

• 2026-09-08: Information published.