CVE-2018-8598: Microsoft Excel

Medium severity, CVSS 4.7. EPSS: 6.2% chance of exploitation in the next 30 days.

An information disclosure vulnerability exists when Microsoft Excel improperly discloses the contents of its memory, aka "Microsoft Excel Information Disclosure Vulnerability." This affects Office 365 ProPlus, Microsoft Office, Microsoft Excel. This CVE ID is unique from CVE-2018-8627.

Affected products

• Microsoft Excel: version 2010 only; version 2013 only; version 2016 only
• Microsoft Office: version 2019 only
• Microsoft Office 365 Proplus: affected versions not specified

Published 2018-12-12. Last modified 2026-06-17.