Outlook 365 / 2021 / 2019 / 2016 Update for August 2023

The July security and rollup update has been made available for all Click-to-Run installations of Outlook 2016, Outlook 2019, Outlook 2021 and Outlook as part of a Microsoft 365 subscription.

It contains 9 security updates for Excel (2), Outlook (1), Visio (3), and Office (3). The details about the Outlook vulnerability can be found below;

  • CVE-2023-36893: Microsoft Outlook Spoofing Vulnerability
    • This vulnerability is currently not publicly disclosed nor exploited.
    • Exploitation of the vulnerability requires that a user with an affected version of Outlook opens a malicious meeting or appointment invite from the attacker.
    • The Preview Pane is not an attack vector.
    • The Exploitability Assessment is rated: Exploitation Less Likely.

In addition, it contains 3 non-security fixes related to Outlook Current Channel Version 2307, and 1 new feature and 2 fixes related to Outlook Monthly Enterprise Version 2306.

  • Version 2307
    • We fixed an issue that caused Outlook to fail to show Top Search Results in some views.
    • We fixed an issue where Microsoft 365 links failed to launch properly.
    • We fixed an issue that caused users to receive errors about having too many Actionable Messages open more frequently than expected.
  • Version 2306
    • Accessibility Ribbon in Outlook for Windows
      The Accessibility Ribbon brings together in one place all the tools you need to make your emails accessible.
    • We fixed an issue that caused users to get prompted to save changes to an unmodified email message.
    • We fixed an issue where the Me control showed the wrong display name in Office apps.

Based on your release channel, you’ll be updated to the following version;

  • Microsoft 365 Apps, Outlook 2016 Retail, Outlook 2019 Retail, Outlook 2021 Retail
    Version 2307 (Build 16626.20170)
  • Monthly Enterprise
    Version 2306 (Build 16529.20226)
    Version 2305 (Build 16501.20286)
  • Semi-Annual Enterprise (Preview)
    Version 2302 (Build 16130.20714)
  • Semi-Annual Enterprise
    Version 2302 (Build 16130.20714)
    Version 2208 (Build 15601.20742)
    Version 2202 (Build 14931.21078) 
  • Outlook LTSC 2021
    Version 2108 (Build 14332.20546)
  • Outlook 2019 Volume Licensed
    Version 1808 (Build 10401.20025)

Note: Depending on your installation type, this update can be installed via the Update Now button in Outlook itself or the Microsoft Store. This update does not apply to msi-based installations of Office 2016.