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CVE-2020-1103: Microsoft SharePoint Information Disclosure Vulnerability
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-05-21 · updated 2026-08-19
- Weakness: CWE-352
Description
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.
Affected products
- Microsoft SharePoint Server: 2016
- Microsoft SharePoint Foundation 2013 Service Pack 1: 2013-sp1
- Microsoft SharePoint Server: 2019
- Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before publication — fixed in publication
- Microsoft SharePoint Foundation 2013 Service Pack 1: from 15.0.0 before publication — fixed in publication
- Microsoft SharePoint Server: from 16.0.0 before publication — fixed in publication
How to fix
Upgrade to a fixed version: Microsoft Sharepoint Enterprise Server 2016 publication; Microsoft SharePoint Foundation 2013 Service Pack 1 publication; Microsoft SharePoint Server publication. Check the vendor advisory for mitigations.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1103
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1103
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