Search: CVE-2025-53771

Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

This report discusses open-source intelligence (OSINT) related to disrupting active exploitation of vulnerabilities in on-premises SharePoint deployments. The threat involves multiple advanced persistent threat (APT) groups such as APT31, Emissary Panda, and Storm-2603, leveraging techniques including exploitation of public-facing applications, PowerShell execution, web shells, reflective code loading, and automated data collection. No specific CVE or technical details are provided, and no patch is currently available. The threat is assessed as high severity due to active exploitation and involvement of sophisticated threat actors.