CVE-2020-0891 Cross-site scripting in Microsoft SharePoint Enterprise Server

Medium 5.4 Published 12 Mar 2020 Updated 28 Feb 2025

An authenticated attacker can execute arbitrary scripts in the victim's browser via a specially crafted request to Microsoft SharePoint Server.

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-2020-0891?

CVE-2020-0891 is a medium-severity cross-site scripting vulnerability in Microsoft Sharepoint Enterprise Server, published on 12 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

This vulnerability is caused when SharePoint Server does not properly sanitize a specially crafted request to an affected SharePoint server.An authenticated attacker could exploit this vulnerability by sending a specially crafted request to an affected SharePoint server, aka 'Microsoft SharePoint Reflective XSS Vulnerability'. This CVE ID is unique from CVE-2020-0795.

Weakness: CWE-79

Which versions are affected by CVE-2020-0891?

It affects 3 products.

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

How do I fix CVE-2020-0891?

No fix has been published for CVE-2020-0891 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-2020-0891 being exploited?

There is no known exploitation of CVE-2020-0891 in the wild and no public exploit code.

All Microsoft Sharepoint Enterprise Server vulnerabilities

Sources

Also known as GHSA-5c7f-r598-xvcq.