# CVE-2026-85873: Skype for Business Elevation of Privilege Vulnerability

CVE-2026-85873 is fixed in 3 products on 1 platform, first by KB5132779, released October 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-85873
- Priority: Routine
- CVSS: 6.5 (Important)
- EPSS: 0.0096
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 13, 2026
- Weakness: Authorization Bypass Through User-Controlled Key
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85873

## Description

<p>Improper authorization in Skype for Business and Microsoft Lync allows an authorized attacker to elevate privileges over a network.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Skype for Business Server 2015 CU13 |  | [KB5132779](https://patchblox.com/security/data/fix/microsoft/kb5132779.md) | Oct 13, 2026 |
| Microsoft | Skype for Business Server 2019 CU8 |  | [KB5131693](https://patchblox.com/security/data/fix/microsoft/kb5131693.md) | Oct 13, 2026 |
| Microsoft | Skype for Business Server Subscription Edition CU1 |  | [KB5131692](https://patchblox.com/security/data/fix/microsoft/kb5131692.md) | Oct 13, 2026 |

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Data as of 2026-11-09T01:18:40Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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