HIGH 7.5 Microsoft
CVE-2026-69378
Microsoft Exchange Server Denial of Service Vulnerability
Microsoft Security Update 2026-Sep: Microsoft Exchange Server Denial of Service Vulnerability
Affected Products
- 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
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378
- https://nvd.nist.gov/vuln/detail/CVE-2026-69378
This high severity vulnerability with a CVSS score of 7.5 was published on 2026-09-08 via Microsoft. Affected: Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server Subscription Edition RTM and 1 more.
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