EMERGENCY MANAGEMENT association OF TEXAS

CISA is aware of active exploitation of a new remote code execution (RCE) vulnerability enabling unauthorized access to on-premise SharePoint servers. While the scope and impact continue to be assessed, the new Common Vulnerabilities and Exposures (CVE), CVE-2025-53770, is a variant of the existing vulnerability CVE-2025-49706 and poses a risk to organizations. This exploitation activity, publicly reported as “ToolShell,” provides unauthenticated access to systems and enables malicious actors to fully access SharePoint content, including file systems and internal configurations, and execute code over the network. 

Organizations should report incidents and anomalous activity to CISA’s 24/7 Operations Center at Report@cisa.gov or (888) 282-0870.