title: Microsoft Office Elevation of Privilege Vulnerability
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>
problem types: Elevation of Privilege
affected:
{
vendor: Microsoft
product: Skype for Business Server 2019  CU2
cpes: cpe:2.3:a:microsoft:skype_for_business_server:2019:cu2:*:*:*:*:*:*
platforms: Unknown
versions:
version: 7.0.0, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Skype for Business Server 2015 CU 8
cpes: cpe:2.3:a:microsoft:skype_for_business_server:2015:cu8:*:*:*:*:*:*
platforms: Unknown
versions:
version: 2015 CU 8, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Microsoft Lync Server 2013
cpes: cpe:2.3:a:microsoft:lync_server:2013:*:*:*:*:*:*:*
platforms: Unknown
versions:
version: 0, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Microsoft SharePoint Enterprise Server 2016
cpes: cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
platforms: x64-based Systems
versions:
version: 16.0.0, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Microsoft SharePoint Server 2019
cpes: cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 16.0.0, lessThan: publication, versionType: custom, status: affected
}
{
vendor: Microsoft
product: Microsoft SharePoint Foundation 2013 Service Pack 1
cpes: cpe:2.3:a:microsoft:sharepoint_foundation:2013:sp1:*:*:*:*:*:*
platforms: x64-based Systems
versions:
version: 15.0.0, lessThan: publication, versionType: custom, status: affected
}
