CVE-2017-11820 Cross-site scripting in Microsoft SharePoint Enterprise Server

Medium 5.4 Published 13 Oct 2017 Updated 16 Sep 2024

An attacker can execute arbitrary scripts in the context of a SharePoint user's browser by sending a specially crafted request, potentially leading to session hijacking or data theft.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2017-11820?

CVE-2017-11820 is a medium-severity cross-site scripting vulnerability in Microsoft Sharepoint Enterprise Server, published on 13 Oct 2017. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Microsoft SharePoint Enterprise Server 2013 SP1 and Microsoft SharePoint Enterprise Server 2016 allow an attacker to exploit a cross-site scripting (XSS) vulnerability by sending a specially crafted request to an affected SharePoint server, due to how SharePoint Server sanitizes web requests, aka "Microsoft Office SharePoint XSS Vulnerability". This CVE ID is unique from CVE-2017-11775 and CVE-2017-11777.

Weakness: CWE-79

Which versions are affected by CVE-2017-11820?

It affects 1 product.

Products include Microsoft Sharepoint Enterprise Server.

How do I fix CVE-2017-11820?

No fix has been published for CVE-2017-11820 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2017-11820 being exploited?

There is no known exploitation of CVE-2017-11820 in the wild and no public exploit code.

All Microsoft Sharepoint Enterprise Server vulnerabilities

Sources

Also known as GHSA-389r-v5pg-54r7.