# KB5128897: October 2026 security update

KB5128897, released October 13, 2026, fixes 6 CVEs in Microsoft Exchange Server 2019 Cumulative Update 14. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb5128897
- Platform: Microsoft
- Released: Oct 13, 2026
- Priority: Urgent (Closes CVE-2026-70571, exploitation more likely)
- CVEs: 6, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5128897

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2019 Cumulative Update 14](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-14.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-70571](https://patchblox.com/security/data/cve/CVE-2026-70571.md) | Urgent | Microsoft Exchange Server | 8.1 | 0.0139 | More likely |
| [CVE-2026-70279](https://patchblox.com/security/data/cve/CVE-2026-70279.md) | Urgent | Microsoft Exchange Server | 9.3 | 0.0129 | More likely |
| [CVE-2026-87692](https://patchblox.com/security/data/cve/CVE-2026-87692.md) | High | Microsoft Exchange Server | 7.8 | 0.0231 |  |
| [CVE-2026-77910](https://patchblox.com/security/data/cve/CVE-2026-77910.md) | High | Microsoft Exchange Server | 8.8 | 0.0087 |  |
| [CVE-2026-87696](https://patchblox.com/security/data/cve/CVE-2026-87696.md) | High | Microsoft Exchange Server | 7.5 | 0.0042 |  |
| [CVE-2026-87695](https://patchblox.com/security/data/cve/CVE-2026-87695.md) | High | Microsoft Exchange Server | 7.8 | 0.0029 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo