CVE-2018-8426 Cross-site scripting in Microsoft SharePoint
An attacker can execute arbitrary scripts in the context of a user's browser via a crafted request to Microsoft SharePoint.
- 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-2018-8426?
CVE-2018-8426 is a medium-severity cross-site scripting vulnerability in Microsoft SharePoint, published on 13 Sep 2018. 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 affects Microsoft SharePoint Server, Microsoft SharePoint.
Weakness: CWE-79
Which versions are affected by CVE-2018-8426?
It affects 3 products.
Products include Microsoft Sharepoint Enterprise Server 2013, Microsoft Sharepoint Enterprise Server 2016, Microsoft Sharepoint Server 2010.
How do I fix CVE-2018-8426?
No fix has been published for CVE-2018-8426 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-2018-8426 being exploited?
There is no known exploitation of CVE-2018-8426 in the wild and no public exploit code.
Sources
Also known as GHSA-87vw-7wf8-wpfx.