Cross-site scripting in Microsoft SharePoint Server - CVE-2026-109497
Published: November 10, 2026
Vulnerability identifier: #VU164748
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-2026-109497
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, disclose sensitive information, and perform unauthorized actions in a victim's browser context.
The vulnerability exists due to improper neutralization of input during web page generation in Microsoft SharePoint Server when rendering user-supplied content. A remote user can inject malicious script into web content to execute it in a victim's browser following user interaction, enabling content spoofing, access to sensitive information, and unauthorized actions in the affected application.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-109497
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20278