Cross-site scripting in Microsoft SharePoint Server - CVE-2026-111300
Published: November 11, 2026
Vulnerability identifier: #VU164798
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-2026-111300
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 modify content in a victim's browser.
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, disclose sensitive information, and modify content in the victim's browser.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-111300
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20278