# KB4011027: December 2018 security update

KB4011027, released December 11, 2018, fixes 2 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/fix/microsoft/kb4011027
- Platform: Microsoft
- Released: Dec 11, 2018
- Priority: Urgent (Closes CVE-2018-8628, exploitation more likely)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/4011027

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Office Online Server](https://patchblox.com/security/data/product/microsoft/microsoft-office-online-server.md) |  |  |
| [Office Online Server](https://patchblox.com/security/data/product/microsoft/office-online-server.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2018-8628](https://patchblox.com/security/data/cve/CVE-2018-8628.md) | Urgent | Microsoft Office | n/a | 0.1590 | More likely |
| [CVE-2018-8627](https://patchblox.com/security/data/cve/CVE-2018-8627.md) | High | Microsoft Office | n/a | 0.0862 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo