CVE-2018-0909 Cross-site scripting in Microsoft SharePoint

High 8.8 Published 14 Mar 2018 Updated 17 Sep 2024

Attackers can exploit improper sanitization of web requests in Microsoft SharePoint to achieve elevation of privilege.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-0909?

CVE-2018-0909 is a high-severity cross-site scripting vulnerability in Microsoft Sharepoint Enterprise Server, published on 14 Mar 2018. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Microsoft Project Server 2013 SP1 and Microsoft SharePoint Enterprise Server 2016 allow an elevation of privilege vulnerability to due how specially crafted web requests are sanitized, aka "Microsoft SharePoint Elevation of Privilege Vulnerability". This CVE is unique from CVE-2018-0910, CVE-2018-0911, CVE-2018-0912, CVE-2018-0913, CVE-2018-0914, CVE-2018-0915, CVE-2018-0916, CVE-2018-0917, CVE-2018-0921, CVE-2018-0923, CVE-2018-0944 and CVE-2018-0947.

Weakness: CWE-79

Which versions are affected by CVE-2018-0909?

It affects 2 products.

Products include Microsoft Project Server, Microsoft Sharepoint Enterprise Server.

How do I fix CVE-2018-0909?

No fix has been published for CVE-2018-0909 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-2018-0909 being exploited?

There is no known exploitation of CVE-2018-0909 in the wild and no public exploit code.

All Microsoft Sharepoint Enterprise Server vulnerabilities

Sources

Also known as GHSA-x3rx-wjvf-34g8.