Microsoft · Security update · October 14, 2025
KB5066366: October 2025 security update
KB5066366, released October 14, 2025, fixes 3 CVEs in Microsoft Exchange Server Subscription Edition RTM. None of them is reported as exploited. Patch Radar priority: High.
High
CVEs closed
3
None rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0102
63rd percentile
Priority of the 3 CVEs
Patch now 0
Urgent 0
High 3
Routine 0
Applies to
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| High | CVE-2025-59248 | Microsoft Exchange Server | Spoofing | 7.5 | 0.0102 | Exploitation Less Likely |
| High | CVE-2025-59249 | Microsoft Exchange Server | Elevation of Privilege | 8.8 | 0.0085 | Exploitation Unlikely |
| High | CVE-2025-53782 | Microsoft Exchange Server | Elevation of Privilege | 8.4 | 0.0037 | Exploitation Less Likely |
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