This vulnerability (CVE-2026-45453) 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 flaw allows an attacker to inject malicious scripts that can perform spoofing attacks when users access affected web pages. The CVSS 3.1 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 published an official fix for this vulnerability.

Exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the affected SharePoint web pages, potentially leading to spoofing attacks that compromise user trust and data confidentiality and integrity. There is no indication of impact on availability. No known exploits are reported in the wild at this time.

An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45453 to remediate this vulnerability.