TT-CSIRT – 459.20.07.26 – SharePoint Hardening After New Exploitations (CVE-2026-58644) Please be advised of active exploitation of vulnerabilities CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644, enabling cyber threat actors to gain unauthorized access to on-premises SharePoint Server instances. These vulnerabilities affect all supported on-premises SharePoint Server versions (...