CVE-2026-108438: Microsoft Office Word Information Disclosure Vulnerability

Overview

Severity

Medium (CVSS 6.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Information Disclosure

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Oct

Released

2026-10-15

Last Updated

2026-10-15

Description

Use after free in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

FAQ

Is the Preview Pane an attack vector for this vulnerability? No, the Preview Pane is not an attack vector. What type of information could be disclosed by this vulnerability? An attacker who successfully exploited this vulnerability could potentially read portions of process memory.

Affected Products (5)

Microsoft Office

• Microsoft 365 Apps for Enterprise for 64-bit Systems
• Microsoft 365 Apps for Enterprise for 32-bit Systems
• Microsoft Office LTSC for Mac 2021
• Microsoft Office LTSC for Mac 2024
• Microsoft Office 365 for Mac

Security Updates (2)

• Release Notes
• Release Notes

Acknowledgments

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

Revision History

• 2026-10-15: Information published.
• 2026-10-15: Information published. This CVE was addressed by updates that were released in October 2026, but the CVE was inadvertently omitted from the October 2026 Security Updates. This is an informational change only. Customers who have already installed the October 2026 updates do not need to take any further action.