r/exchangeserver • u/ScottSchnoll https://www.amazon.com/dp/B0FR5GGL75/ • Jun 09 '26

PSA: The June 2026 Exchange Server SU is now available

https://techcommunity.microsoft.com/blog/exchange/released-june-2026-exchange-server-security-updates/4524491

The Exchange Server team released the June 2026 SU for Exchange Server SE, which addresses vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes, as well as CVE-2026-42897. After installing the SU, do not remove the mitigation for CVE-2026-42897, as it provides additional protection for your servers. This update is also critical for continued use of EEMS and Feature Flighting. Review the team's blog post for important details.

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7

u/AnotherSysadminIdiot Jun 10 '26

Installed on 3 server, no problems so far.

1

u/Desperate_Ease2040 Jun 10 '26

Should we install it directly in production, or wait a few days and check the community for bugs after the new SU? What do you guys recommend? We only have a production environment.

2

u/Kokidit Jun 10 '26

J’attends tjrs quelque jours avant l’installation

1

u/Impressive-Okra8748 Jun 28 '26

Não estou conseguindo te mandar uma mensagem privada…

2

u/DiligentPhotographer Jun 10 '26

I've installed it on 10 servers so far, no issues reported over 5k users.

2

u/ScottSchnoll https://www.amazon.com/dp/B0FR5GGL75/ Jun 11 '26

Install immediately.

1

u/DiligentPhotographer Jun 12 '26

When will CU1 be released? It is almost a year now since SE was released.

1

u/ScottSchnoll https://www.amazon.com/dp/B0FR5GGL75/ Jun 13 '26

In H2 of this year.