# KB5002863: May 2026 security update

KB5002863, released May 12, 2026, fixes 9 CVEs in Microsoft SharePoint Server Subscription Edition. One of them is being exploited (CVE-2026-45659); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb5002863
- Platform: Microsoft
- Released: May 12, 2026
- Priority: Patch now (Closes CVE-2026-45659, exploited (CISA KEV, ransomware))
- CVEs: 9, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/5002863

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft SharePoint Server Subscription Edition](https://patchblox.com/security/data/product/microsoft/microsoft-sharepoint-server-subscription-edition.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-45659](https://patchblox.com/security/data/cve/CVE-2026-45659.md) | Patch now | Microsoft Office SharePoint | 8.8 | 0.8024 | CISA KEV, Ransomware |
| [CVE-2026-40365](https://patchblox.com/security/data/cve/CVE-2026-40365.md) | Urgent | Microsoft Office SharePoint | 8.8 | 0.0096 |  |
| [CVE-2026-40367](https://patchblox.com/security/data/cve/CVE-2026-40367.md) | Urgent | Microsoft Office Word | 8.4 | 0.0045 |  |
| [CVE-2026-33112](https://patchblox.com/security/data/cve/CVE-2026-33112.md) | High | Microsoft Office SharePoint | 8.8 | 0.3112 |  |
| [CVE-2026-35439](https://patchblox.com/security/data/cve/CVE-2026-35439.md) | High | Microsoft Office SharePoint | 8.8 | 0.0203 |  |
| [CVE-2026-33110](https://patchblox.com/security/data/cve/CVE-2026-33110.md) | High | Microsoft Office SharePoint | 8.8 | 0.0197 |  |
| [CVE-2026-40368](https://patchblox.com/security/data/cve/CVE-2026-40368.md) | High | Microsoft Office SharePoint | 8.0 | 0.0182 |  |
| [CVE-2026-40357](https://patchblox.com/security/data/cve/CVE-2026-40357.md) | High | Microsoft Office SharePoint | 8.8 | 0.0170 |  |
| [CVE-2026-47294](https://patchblox.com/security/data/cve/CVE-2026-47294.md) | High | Microsoft Office SharePoint | 8.0 | 0.0061 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo