# KB4011231: October 2017 security update

KB4011231, released October 10, 2017, fixes 1 CVE in Microsoft Office Web Apps Server 2013 Service Pack 1. One of them is being exploited (CVE-2017-11826); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/microsoft/kb4011231
- Platform: Microsoft
- Released: Oct 10, 2017
- Priority: Patch now (Closes CVE-2017-11826, exploited (CISA KEV))
- CVEs: 1, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/4011231

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Microsoft Office Web Apps Server 2013 Service Pack 1](https://patchblox.com/security/data/product/microsoft/microsoft-office-web-apps-server-2013-service-pack-1.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2017-11826](https://patchblox.com/security/data/cve/CVE-2017-11826.md) | Patch now | Microsoft Office | n/a | 0.8133 | CISA KEV, Disclosed |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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