CVE-2026-70300: Microsoft Office Word Remote Code Execution Vulnerability

Overview

Severity

Critical (CVSS 9.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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-Oct

Released

2026-10-13

Description

Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

FAQ

How could an attacker exploit this vulnerability? An attacker could send a specially crafted WordPerfect document with a linked graphics file to a target user. The vulnerability can be triggered when Microsoft Word processes the document in the Reading Pane; the user does not need to open the document. Successful exploitation could allow the attacker to execute code on the user's system. Authentication is not required. Is the Preview Pane an attack vector for this vulnerability? Yes, the Preview Pane is an attack vector.

Affected Products (6)

Microsoft Office

• 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

Acknowledgments

Anonymous

Revision History

• 2026-10-13: Information published.