CVE-2018-8310: Microsoft Office

High severity, CVSS 7.5. EPSS: 5.7% chance of exploitation in the next 30 days.

A tampering vulnerability exists when Microsoft Outlook does not properly handle specific attachment types when rendering HTML emails, aka "Microsoft Office Tampering Vulnerability." This affects Microsoft Word, Microsoft Office.

Affected products

• Microsoft Office: version 2010 only; version 2016 only
• Microsoft Word: version 2010 only; version 2013 only; version 2016 only

Published 2018-07-11. Last modified 2026-06-17.