CVE-2018-8582: Microsoft Office 365 Proplus

High severity, CVSS 8.8. EPSS: 18.6% chance of exploitation in the next 30 days.

A remote code execution vulnerability exists in the way that Microsoft Outlook parses specially modified rule export files, aka "Microsoft Outlook Remote Code Execution Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Outlook. This CVE ID is unique from CVE-2018-8522, CVE-2018-8524, CVE-2018-8576.

Affected products

• Microsoft Office 365 Proplus: affected versions not specified
• Microsoft Outlook: version 2010 only; version 2013 only; version 2016 only
• Microsoft Outlook Rt: version 2013 only
• Microsoft Windows Server 2019: affected versions not specified

Published 2018-11-14. Last modified 2026-06-17.