CISA Urges SharePoint Hardening Amid Active Exploitation of New Vulnerability

The Cybersecurity and Infrastructure Security Agency (CISA) has added a new vulnerability, CVE-2026-58644, to its catalog of actively exploited flaws. This vulnerability, alongside others, is being used to gain unauthorized access and execute remote code on on-premises SharePoint Server instances. CISA recommends immediate patching, enabling antimalware integration, and implementing additional hardening measures to protect systems.