CVE-2018-8558: Microsoft Office

Medium severity, CVSS 6.5. EPSS: 5.6% chance of exploitation in the next 30 days.

An information disclosure vulnerability exists when Microsoft Outlook fails to respect "Default link type" settings configured via the SharePoint Online Admin Center, aka "Microsoft Outlook Information Disclosure Vulnerability." This affects Office 365 ProPlus, Microsoft Office. This CVE ID is unique from CVE-2018-8579.

Affected products

• Microsoft Office: version 2019 only
• Microsoft Office 365 Proplus: affected versions not specified

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