This vulnerability (CVE-2026-45462) in Microsoft SharePoint Enterprise Server 2016 is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation, commonly known as cross-site scripting). It allows an authorized attacker to inject malicious scripts due to insufficient input sanitization during page generation, potentially enabling spoofing attacks. The CVSS 3.1 base score is 4.6 (medium severity), reflecting network attack vector, low attack complexity, required privileges, and user interaction. Microsoft has released an official fix for this vulnerability.

An authorized attacker could exploit this vulnerability to perform spoofing attacks by injecting malicious scripts into web pages generated by SharePoint. The impact includes limited confidentiality and integrity loss but no availability impact. This could lead to unauthorized actions performed in the context of the victim user.

An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 version 16.0.0 should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45462 to remediate this vulnerability.