Microsoft · Security update · May 12, 2026
KB5078943: May 2026 security update
KB5078943, released May 12, 2026, fixes 3 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent. The product is no longer supported.
UrgentUnsupported product
CVEs closed
3
1 rated Critical
Exploited
0
None reported
Exploitation more likely
0
Vendor assessment
Highest EPSS
0.0119
68th percentile
Priority of the 3 CVEs
Patch now 0
Urgent 1
High 1
Routine 1
Applies to
| Product |
|---|
| Microsoft Dynamics 365 (on-premises) version 9.0 |
| Microsoft Dynamics 365 (on-premises) version 9.1 |
CVEs this fix closes
| Priority | CVE | Component | Impact | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|---|
| Urgent | CVE-2026-42898 | Microsoft Dynamics 365 (on-premises) | Remote Code Execution | 9.9 | 0.0119 | Exploitation Unlikely |
| High | CVE-2026-42833 | Microsoft Dynamics 365 (on-premises) | Remote Code Execution | 9.1 | 0.0075 | Exploitation Less Likely |
| Routine | CVE-2026-33103 | Microsoft Dynamics 365 (on-premises) | Information Disclosure | 5.5 | 0.0022 | Exploitation Unlikely |
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