Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

Responding to ToolShell: A Microsoft SharePoint zero-day vulnerability

A newly discovered exploit, “ToolShell,” is fueling a wave of targeted attacks against on-premises Microsoft SharePoint servers. The zero-day exploit chains two vulnerabilities—CVE-2025-53770, a remote code execution (RCE) vulnerability and CVE-2025-53771, a spoofing vulnerability that allows attackers to bypass authentication. When combined, this critical zero-day vulnerability gives attackers persistent unauthenticated remote access to on-premises SharePoint servers.

Modern application control, done right with least privilege

When attackers gain access to a single endpoint—like a developer’s workstation or an HR system—it’s often game over. With some skill and patience, that foothold can escalate into full-blown disruption: stolen data, operational downtime, and brand damage. For years, technologies like application control have served as the frontline defense against this. But in a world rife with rapid change and evolving threats, traditional approaches are showing their age.