Fortinet Issues Emergency Patch for Critical Zero-Day Vulnerability in FortiClient EMS

Fortinet (FTNT) has released an urgent security hotfix to address a critical zero-day vulnerability affecting its FortiClient EMS endpoint management software. The flaw, identified as CVE-2026-35616, received a severity rating of 9.1 out of 10, highlighting its severe potential impact on enterprise security. According to security reports, the vulnerability allows unauthenticated attackers to execute remote code on compromised systems. Evidence suggests that hackers have been actively exploiting this weakness in the wild since late March 2026. This incident marks the second major security exploit for Fortinet this year, raising concerns about the resilience of its software suite. Market analysts suggest that the news could weigh on the company's stock price due to potential reputational damage and increased scrutiny from cybersecurity clients.