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Description of the security update for Microsoft Exchange Server 2019 CU15: February 10, 2026 (KB5074993)

🗓️ 10 Feb 2026 16:00:00Reported by MicrosoftType 
mskb
 mskb
🔗 support.microsoft.com👁 58 Views

Security update for Exchange Server 2019 CU15 fixes spoofing CVE-2026-21527 and ESU guidance.

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10 Feb 2026 16:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.16.5
EPSS0.00069
SSVC
58