# KB5131693: October 2026 security update

KB5131693, released October 13, 2026, fixes 3 CVEs in Skype for Business Server 2019 CU8. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/microsoft/kb5131693
- Platform: Microsoft
- Released: Oct 13, 2026
- Priority: High (Closes CVE-2026-70297, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://support.microsoft.com/help/5131693

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Skype for Business Server 2019 CU8](https://patchblox.com/security/data/product/microsoft/skype-for-business-server-2019-cu8.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-70297](https://patchblox.com/security/data/cve/CVE-2026-70297.md) | High | Skype for Business and Microsoft Lync | 8.8 | 0.0116 |  |
| [CVE-2026-83746](https://patchblox.com/security/data/cve/CVE-2026-83746.md) | High | Skype for Business and Microsoft Lync | 8.1 | 0.0115 |  |
| [CVE-2026-85873](https://patchblox.com/security/data/cve/CVE-2026-85873.md) | Routine | Skype for Business and Microsoft Lync | 6.5 | 0.0096 |  |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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