This vulnerability (CVE-2026-45465) affects Microsoft SharePoint Enterprise Server 2016 version 16.0.0. It is classified as CWE-79, indicating improper neutralization of input during web page generation, which leads to cross-site scripting (XSS). The vulnerability allows an attacker to conduct spoofing attacks by injecting malicious scripts into web pages. The CVSS v3.1 base score is 5.4 (medium), with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality and integrity. Microsoft has released an official fix to remediate this vulnerability as detailed in their security update guide.

Exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of a user's browser session, potentially leading to spoofing attacks that compromise confidentiality and integrity of data. There is no impact on availability. No known exploits are reported in the wild at this time.

An official fix is available from Microsoft for this vulnerability. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the security update provided by Microsoft as per the advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45465 to remediate this issue.