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All versions Cumulative Update levels are impacted. Updates are available for the following specific builds of Exchange Server:. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment.

These vulnerabilities affect on-premises Microsoft Exchange Server, including servers used by customers in Exchange Hybrid mode. Exchange Online customers are already protected and do not need to take any action.

Because of additional security hardening work for CVE, the following actions should be taken in addition to application of July security updates:. Extend the schema using June CUs. Command will be similar to the following:. During the release of April SUs, we received some reports of issues after installation.

NullReferenceException: Object reference not set to an instance of an object. Please see this KB article for resolution. You can also run the following PowerShell command to check if the Auth Certificate is available on your system:. If there is no Auth Certificate or it has expired, then follow the steps outlined here to configure it correctly.

Please note: In some environments, it may take an hour for the OAuth certificate to be published. KB article is here. Because of the recommended schema update requiring the latest set of June CUs, there are several scenarios that you might need to follow:. Use the Exchange Server Health Checker script use the latest release to inventory your servers. If you encounter errors during installation, see the SetupAssist script.

If something does not work properly after updates, see Repair failed installations of Exchange Cumulative and Security updates.

My organization is in Hybrid mode with Exchange Online. Do I need to do anything? While Exchange Online customers are already protected, the July security updates do need to be applied to your on-premises Exchange Servers, even if they are used only for management purposes. Servers or workstations running only Microsoft Exchange Management Tools no Exchange services do not need to apply these updates. Instructions seem to indicate that for Exchange , we should extend the schema after July SU is installed; is that correct?

Is this a problem? There is no dependency in July SUs on this schema change, or vice versa. Just make sure that both of those actions are taken; order is not important. You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in. Products 68 Special Topics 42 Video Hub Most Active Hubs Microsoft Teams. Security, Compliance and Identity. Microsoft Edge Insider. Microsoft FastTrack. Microsoft Viva.

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Show only Search instead for. Did you mean:. Sign In. The Exchange Team. Microsoft has released security updates for vulnerabilities found in: Exchange Server Exchange Server Exchange Server All versions Cumulative Update levels are impacted. Older versions of Exchange earlier than Or Exchange no longer installed in the forest How to update AD schema to address CVE if Exchange is very old or no longer installed Known issues in July security updates During the release of April SUs, we received some reports of issues after installation.

Cmdlets executed against the Exchange Management Console using an invoked runspace might fail with the following error message: The syntax is not supported by this runspace. This can occur if the runspace is in no-language mode. Please see this KB article for more information. You should avoid running mixed pools servers with the latest SU applied together with servers which have not yet received the update.

CurrentCertificateThumbprint If there is no Auth Certificate or it has expired, then follow the steps outlined here to configure it correctly. If you encounter errors during or after installation of Exchange Server updates If you encounter errors during installation, see the SetupAssist script. Please see this for more information on update cadence. Tags: Announcements. Resize Editor. Version history. Last update:. Updated by:. Nino Bilic. Previous Previous Next Next.

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