Description
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
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Microsoft Skype for Business Server 2019 CU2
7.0.0 to < publicationaffected
Microsoft Skype for Business Server 2015 CU 8
2015 CU 8 to < publicationaffected
Microsoft Microsoft Lync Server 2013
0 to < publicationaffected
Microsoft Microsoft SharePoint Enterprise Server 2016
16.0.0 to < publicationaffected
Microsoft Microsoft SharePoint Server 2019
16.0.0 to < publicationaffected
Microsoft Microsoft SharePoint Foundation 2013 Service Pack 1
15.0.0 to < publicationaffected