Cross-site scripting in Microsoft SharePoint Server - CVE-2026-109456
Published: November 10, 2026
Vulnerability identifier: #VU164729
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-109456
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to spoof web content and potentially access or modify information within a victim's browser session.
The vulnerability exists due to improper neutralization of input during web page generation in Microsoft Office SharePoint when rendering user-supplied content. A remote user can inject malicious script into web content and induce a victim to interact with it to spoof content and potentially access or modify information within the affected site's context.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-109456
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20278