CVE-2018-8627: Microsoft Excel

Medium severity, CVSS 5.5. EPSS: 8.6% chance of exploitation in the next 30 days.

An information disclosure vulnerability exists when Microsoft Excel software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory, aka "Microsoft Excel Information Disclosure Vulnerability." This affects Microsoft Office, Office 365 ProPlus, Microsoft Excel, Microsoft Excel Viewer, Excel. This CVE ID is unique from CVE-2018-8598.

Affected products

• Microsoft Excel: version 2010 only; version 2013 only; version 2016 only
• Microsoft Excel Viewer: version 2007 only
• Microsoft Office: version 2010 only; version 2016 only; version 2019 only
• Microsoft Office 365 Proplus: affected versions not specified
• Microsoft Office Compatibility Pack: affected versions not specified
• Microsoft SharePoint Server: version 2010 only

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