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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Microsoft Sharepoint | — | Download and install Microsoft KB4484453Download and install Microsoft KB4484436 | May 15, 2023 | Jul 14, 2020 |
| Msft | — | Security Update for Microsoft SharePoint Foundation 2013 (KB4484448) | Jul 14, 2020 | Jul 14, 2020 |
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