UPDATE: Microsoft re-released the SU on August 15th, 2023. See more details here.

The August 2023 SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Although we are not aware of any active exploits in the wild, our recommendation is to immediately install these updates to protect your environment.

Microsoft has released Security Updates (SUs) for vulnerabilities found in:

  • Exchange Server 2019
  • Exchange Server 2016

SUs are available for the following specific versions of Exchange Server:

  • Exchange Server 2019 CU12 and CU13
  • Exchange Server 2016 CU23

More details about specific CVEs can be found in the Security Update Guide (filter on Exchange Server under Product Family).
Description of the security update for Microsoft Exchange Server 2019 and 2016: August 8, 2023 (KB5029388)

This security update rollup resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures (CVE)

Issues that are fixed in this update

Features introduced in this update 

Known issues in this update

  • After this update is installed, webpage previews for URLs that are shared in Outlook on the web (OWA) are not rendered correctly. We will fix this issue in a future update.

You can get the standalone update package through the Microsoft Download Center.

Update installation

The following update paths are available:

August 2023 Patch Tuesday Installation Path Image

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