critical9.8
CVE-2020-1025
An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation.
Impact
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. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Lync | Version 2013 |
| Microsoft | Sharepoint Enterprise Server | Version 2016 |
| Microsoft | Sharepoint Foundation | Version 2013 |
| Microsoft | Sharepoint Server | Version 2019 |
| Microsoft | Skype For Business | Versions 2015, 2019 |