# KB5002923: September 2026 security update

KB5002923, released September 8, 2026, fixes 30 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb5002923
- Platform: Microsoft
- Released: Sep 8, 2026
- Priority: Urgent (Closes CVE-2026-78509, rated Critical)
- CVEs: 30, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5002923

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Word 2016 (32-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-word-2016-32-bit-edition.md) |  |  |
| [Microsoft Word 2016 (64-bit edition)](https://patchblox.com/security/data/product/microsoft/microsoft-word-2016-64-bit-edition.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-78509](https://patchblox.com/security/data/cve/CVE-2026-78509.md) | Urgent | Microsoft Office Outlook | 9.8 | 0.0097 |  |
| [CVE-2026-78520](https://patchblox.com/security/data/cve/CVE-2026-78520.md) | Urgent | Microsoft Office Outlook | 6.5 | 0.0092 |  |
| [CVE-2026-78525](https://patchblox.com/security/data/cve/CVE-2026-78525.md) | Urgent | Microsoft Office Outlook | 8.8 | 0.0082 |  |
| [CVE-2026-69556](https://patchblox.com/security/data/cve/CVE-2026-69556.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69671](https://patchblox.com/security/data/cve/CVE-2026-69671.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69686](https://patchblox.com/security/data/cve/CVE-2026-69686.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69722](https://patchblox.com/security/data/cve/CVE-2026-69722.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69759](https://patchblox.com/security/data/cve/CVE-2026-69759.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69764](https://patchblox.com/security/data/cve/CVE-2026-69764.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-72972](https://patchblox.com/security/data/cve/CVE-2026-72972.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-72973](https://patchblox.com/security/data/cve/CVE-2026-72973.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-77901](https://patchblox.com/security/data/cve/CVE-2026-77901.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-78504](https://patchblox.com/security/data/cve/CVE-2026-78504.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-78511](https://patchblox.com/security/data/cve/CVE-2026-78511.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-78514](https://patchblox.com/security/data/cve/CVE-2026-78514.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-78517](https://patchblox.com/security/data/cve/CVE-2026-78517.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-78521](https://patchblox.com/security/data/cve/CVE-2026-78521.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-80080](https://patchblox.com/security/data/cve/CVE-2026-80080.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-80085](https://patchblox.com/security/data/cve/CVE-2026-80085.md) | High | Microsoft Office Word | 8.8 | 0.0082 |  |
| [CVE-2026-69719](https://patchblox.com/security/data/cve/CVE-2026-69719.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-77911](https://patchblox.com/security/data/cve/CVE-2026-77911.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-78502](https://patchblox.com/security/data/cve/CVE-2026-78502.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-78503](https://patchblox.com/security/data/cve/CVE-2026-78503.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-78522](https://patchblox.com/security/data/cve/CVE-2026-78522.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-80079](https://patchblox.com/security/data/cve/CVE-2026-80079.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-80090](https://patchblox.com/security/data/cve/CVE-2026-80090.md) | Routine | Microsoft Office Word | 6.5 | 0.0092 |  |
| [CVE-2026-78506](https://patchblox.com/security/data/cve/CVE-2026-78506.md) | Routine | Microsoft Office Word | 5.5 | 0.0054 |  |
| [CVE-2026-83949](https://patchblox.com/security/data/cve/CVE-2026-83949.md) | Routine | Microsoft Office Word | 5.5 | 0.0054 |  |
| [CVE-2026-83951](https://patchblox.com/security/data/cve/CVE-2026-83951.md) | Routine | Microsoft Office Word | 5.5 | 0.0054 |  |
| [CVE-2026-72976](https://patchblox.com/security/data/cve/CVE-2026-72976.md) | Routine | Microsoft Office Word | 5.0 | 0.0051 |  |

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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