CVE-2026-55135: Microsoft SharePoint Server Spoofing Vulnerability
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Other sources
Microsoft SharePoint Server Spoofing Vulnerability
— Microsoft
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55135?
The severity of CVE-2026-55135 is rated as medium with a score of 5.4.
How do I fix CVE-2026-55135?
The recommended fix for CVE-2026-55135 is to apply the available patch provided by Microsoft.
What is CVE-2026-55135?
CVE-2026-55135 is a spoofing vulnerability in Microsoft SharePoint Server caused by improper input neutralization during web page generation.
Which software is affected by CVE-2026-55135?
CVE-2026-55135 affects Microsoft SharePoint Server, SharePoint Server Subscription Edition, SharePoint Enterprise Server 2016, and SharePoint Server 2019.
Who can exploit CVE-2026-55135?
An authorized attacker with access to the network can exploit CVE-2026-55135 to perform spoofing.