# 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.

- Web page: https://patchblox.com/security/fix/microsoft/kb5078943
- Platform: Microsoft
- Released: May 12, 2026
- Priority: Urgent (Closes CVE-2026-42898, rated Critical)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5078943

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Dynamics 365 (on-premises) version 9.0](https://patchblox.com/security/data/product/microsoft/microsoft-dynamics-365-on-premises-version-9.0.md) |  |  |
| [Microsoft Dynamics 365 (on-premises) version 9.1](https://patchblox.com/security/data/product/microsoft/microsoft-dynamics-365-on-premises-version-9.1.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-42898](https://patchblox.com/security/data/cve/CVE-2026-42898.md) | Urgent | Microsoft Dynamics 365 (on-premises) | 9.9 | 0.0119 |  |
| [CVE-2026-42833](https://patchblox.com/security/data/cve/CVE-2026-42833.md) | High | Microsoft Dynamics 365 (on-premises) | 9.1 | 0.0075 |  |
| [CVE-2026-33103](https://patchblox.com/security/data/cve/CVE-2026-33103.md) | Routine | Microsoft Dynamics 365 (on-premises) | 5.5 | 0.0022 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo