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KB5103215

Security update fixing 4 CVEs

Support article Update Catalog CVEs in Security CVE list for a ticket
0Windows versions
4CVEs fixed · 1 critical
0Exploited or in CISA KEV
0Open known issues affecting it
YesRestart required (per MSRC)

Known issues in this update

Windows release health

No known issues listed

Windows release health lists no issues from this KB or the update it builds on.

Issues this update resolves

No resolved issues listed

Windows release health names no issues fixed by this KB.

Security fixes

4 Microsoft CVEs · most urgent first
CVE Vulnerability Severity CVSSEPSSImpact Status
CVE-2026-55008 Microsoft Exchange Server Spoofing VulnerabilityMicrosoft Exchange Server Critical 9.60.9%Spoofing
CVE-2026-55005 Microsoft Exchange Server Remote Code Execution VulnerabilityMicrosoft Exchange Server Important 8.81.0%Remote Code Execution
CVE-2026-55006 Microsoft Exchange Server Elevation of Privilege VulnerabilityMicrosoft Exchange Server Important 7.80.3%Elevation of Privilege
CVE-2026-55009 Microsoft Exchange Server Elevation of Privilege VulnerabilityMicrosoft Exchange Server Important 7.82.5%Elevation of Privilege
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