A critical zero-day vulnerability in FortiClient, tracked as CVE-2026-35616, has prompted Fortinet to release an emergency patch to prevent authentication bypass attacks. This flaw is particularly concerning as it allows attackers to circumvent security measures without being detected. The vulnerability is the latest in a string of Fortinet vulnerabilities that have been exploited by malicious actors, highlighting the need for swift action to mitigate potential threats. Fortinet has taken proactive steps to address the issue, but the exploitation status of CVE-2026-35616 is still being closely monitored to determine the severity of the threat1. The patch is available for immediate deployment, and users are advised to apply it as soon as possible to prevent potential security breaches. This vulnerability matters to security practitioners because it underscores the importance of staying vigilant and responding quickly to emerging threats to prevent unauthorized access to sensitive systems and data.