# KB5074993: February 2026 security update

KB5074993, released February 10, 2026, fixes 1 CVE in Microsoft Exchange Server 2019 Cumulative Update 15. None of them is reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/fix/microsoft/kb5074993
- Platform: Microsoft
- Released: Feb 10, 2026
- Priority: Routine (Closes CVE-2026-21527)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5074993

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Exchange Server 2019 Cumulative Update 15](https://patchblox.com/security/data/product/microsoft/microsoft-exchange-server-2019-cumulative-update-15.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-21527](https://patchblox.com/security/data/cve/CVE-2026-21527.md) | Routine | Microsoft Exchange Server | 6.5 | 0.0814 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo