An information disclosure vulnerability exists where certain modes of the search function in Microsoft SharePoint Server are vulnerable to cross-site search attacks (a variant of cross-site request forgery, CSRF).
When users are simultaneously logged in to Microsoft SharePoint Server and visit a malicious web page, the attacker can, through standard browser functionality, induce the browser to invoke search queries as the logged in user. While the attacker can’t access the search results or documents as such, the attacker can determine whether the query did return results or not, and thus by issuing targeted queries discover facts about documents that are searchable for the logged-in user.
The security update addresses the vulnerability by running the search queries in a way that doesn’t expose them to this browser vulnerability.
## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Microsoft SharePoint Enterprise Server 2013 Service Pack 1 | | [KB4461549](https://patchblox.com/security/data/fix/microsoft/kb4461549.md) | Dec 11, 2018 | | Microsoft | Microsoft SharePoint Enterprise Server 2016 | | [KB4461541](https://patchblox.com/security/data/fix/microsoft/kb4461541.md) | Dec 11, 2018 | | Microsoft | Microsoft SharePoint Foundation 2010 Service Pack 2 | | [KB4461580](https://patchblox.com/security/data/fix/microsoft/kb4461580.md) | Dec 11, 2018 | --- Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo