Outlook 2016 Security Update for July 2019

A Security Update has been released for Outlook 2016. It resolves the following vulnerability;

  • CVE-2019-1084: Microsoft Exchange Information Disclosure Vulnerability (All)
    An information disclosure vulnerability exists when Exchange allows creation of entities with Display Names having non-printable characters. An authenticated attacker could exploit this vulnerability by creating entities with invalid display names, which, when added to conversations, remain invisible. This security update addresses the issue by validating display names upon creation in Microsoft Exchange, and by rendering invalid display names correctly in Microsoft Outlook clients.

Additionally, the holiday file (Outlook.HOL) has been updated to extend the date range to the year 2026 for many events. To update your holidays, you’ll have to remove the current ones from your Calendar and re-import them. For more info see; Holiday updates for the Outlook Calendar.

There is also a fix for an issue where Categories that are set on items in a shared mailbox may not be synced to the server and other clients.

View: Download information for KB4475517

Note: This update can be installed via Microsoft Update and updates Outlook to version 16.0.4873.1000. This update does not apply to Perpetual and Office 365 based installations of Office 2016.