CVE-2019-0831 Cross-site scripting in Microsoft SharePoint Enterprise Server

Medium 5.4 Published 9 Apr 2019 Updated 28 Feb 2025

Attackers can execute arbitrary scripts in user browsers via unsanitized web requests in Microsoft SharePoint, 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-2019-0831?

CVE-2019-0831 is a medium-severity cross-site scripting vulnerability in Microsoft Sharepoint Enterprise Server, published on 9 Apr 2019. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

A cross-site-scripting (XSS) vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server, aka 'Microsoft Office SharePoint XSS Vulnerability'. This CVE ID is unique from CVE-2019-0830.

Weakness: CWE-79

Which versions are affected by CVE-2019-0831?

It affects 3 products.

Products include Microsoft Sharepoint Enterprise Server, Microsoft Sharepoint Foundation, Microsoft Sharepoint Server.

How do I fix CVE-2019-0831?

No fix has been published for CVE-2019-0831 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-2019-0831 being exploited?

There is no known exploitation of CVE-2019-0831 in the wild and no public exploit code.

All Microsoft Sharepoint Enterprise Server vulnerabilities

Sources

Also known as GHSA-3v9q-3mg5-x748.