# CVE-2020-1025: Microsoft Office Elevation of Privilege Vulnerability

CVE-2020-1025 is fixed in 6 products on 1 platform, first by KB4571334, released July 14, 2020. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2020-1025
- Priority: Urgent
- CVSS: n/a (Critical)
- EPSS: 0.0585
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jul 14, 2020
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1025

## Description

<p>An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access.</p> <p>To exploit this vulnerability, an attacker would need to modify the token.</p> <p>The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft Lync Server 2013 |  | [KB4571334](https://patchblox.com/security/data/fix/microsoft/kb4571334.md) | Jul 14, 2020 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |  | [KB4484436](https://patchblox.com/security/data/fix/microsoft/kb4484436.md) | Jul 14, 2020 |
| Microsoft | Microsoft SharePoint Foundation 2013 Service Pack 1 |  | [KB4484448](https://patchblox.com/security/data/fix/microsoft/kb4484448.md) | Jul 14, 2020 |
| Microsoft | Microsoft SharePoint Server 2019 |  | [KB4484453](https://patchblox.com/security/data/fix/microsoft/kb4484453.md) | Jul 14, 2020 |
| Microsoft | Skype for Business Server 2015 CU 8 |  | [KB4571333](https://patchblox.com/security/data/fix/microsoft/kb4571333.md) | Jul 14, 2020 |
| Microsoft | Skype for Business Server 2019  CU2 |  | [KB4571332](https://patchblox.com/security/data/fix/microsoft/kb4571332.md) | Jul 14, 2020 |

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Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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