An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly verify tenant permissions. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server.
The attacker who successfully exploited the vulnerability could elevate permssions such that they gain full rights to the affected tenant. These attacks could allow the attacker to read content that the attacker is not authorized to read, change permissions, and edit or delete content.
The security update addresses the vulnerability by helping to ensure that SharePoint Server properly checks tenant permissions.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Microsoft SharePoint Enterprise Server 2016 | | [KB4018293](https://patchblox.com/security/data/fix/microsoft/kb4018293.md) | Mar 13, 2018 | | Microsoft | Microsoft SharePoint Foundation 2013 Service Pack 1 | | [KB4018304](https://patchblox.com/security/data/fix/microsoft/kb4018304.md) | Mar 13, 2018 | --- 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.