High [CVE-2026-69378] Microsoft Exchange Server Denial of Service Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-69378 affecting Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server Subscription Edition RTM.
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Summary
Microsoft Exchange Server Denial of Service Vulnerability
Affected products named by the advisory: Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Exchange Server Subscription Edition RTM; Microsoft Exchange Server 2019 Cumulative Update 15.
- Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0 before 15.01.2507.073
- Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0 before 15.02.1544.046
- Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0 before 15.02.1748.051
- Microsoft Exchange Server Subscription Edition RTM 15.02.0.0 before 15.02.2562.049
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
- KB5121611 (build 15.01.2507.073)
- KB5121610 (build 15.02.1544.046)
- KB5121608 (build 15.02.2562.049)
- KB5121609 (build 15.02.1748.051)
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
Mitigation checklist
- Install the applicable security update for your platform: KB5121611, KB5121610, KB5121608, KB5121609 (see the Microsoft Update Catalog).
Official advisory · high-confidence parse· fetched 3 hours ago·verify at source
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