Critical9.6Microsoft Server Updated
Microsoft Exchange Server Spoofing Vulnerability
CVE-2026-55008 Published Jul 14, 2026Updated by vendor Jul 14, 2026
Affected products & platforms
Microsoft ServerExchange Server
Summary
Microsoft Exchange Server Spoofing Vulnerability Affected products named by the advisory: Microsoft Exchange Server 2016 Cumulative Update 23; Microsoft Exchange Server 2019 Cumulative Update 14; Microsoft Exchange Server 2019 Cumulative Update 15; Microsoft Exchange Server Subscription Edition RTM.
Affected versions
- Microsoft Exchange Server 2016 Cumulative Update 23 15.01.0.0
- Microsoft Exchange Server 2019 Cumulative Update 14 15.02.0.0
- Microsoft Exchange Server 2019 Cumulative Update 15 15.02.0.0
- Microsoft Exchange Server Subscription Edition RTM 15.02.0.0
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
- KB5103215 (build 15.01.2507.071)
- KB5103214 (build 15.02.1544.043)
- KB5103213 (build 15.02.1748.048)
- KB5103212 (build 15.02.2562.045)
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Install the applicable security update for your platform: KB5103215, KB5103214, KB5103213, KB5103212 (see the Microsoft Update Catalog).
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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