# CVE-2017-11820: Microsoft SharePoint Elevation of Privilege Vulnerability

CVE-2017-11820 is fixed in 2 products on 1 platform, first by KB4011180, released October 10, 2017. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2017-11820
- Priority: High
- CVSS: n/a (Important)
- EPSS: 0.0227
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Oct 10, 2017
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2017-11820

## Description

<p>An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server.</p> <p>The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the user, such as change permissions and delete content, and inject malicious content in the browser of the user.</p> <p>The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes web requests.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2013 Service Pack 1 |  | [KB4011180](https://patchblox.com/security/data/fix/microsoft/kb4011180.md) | Oct 10, 2017 |
| Microsoft | Microsoft SharePoint Enterprise Server 2016 |  | [KB4011217](https://patchblox.com/security/data/fix/microsoft/kb4011217.md) | Oct 10, 2017 |

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Data as of 2026-11-07T18:46:35Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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