FortiClientEMS - SQLi (CVE-2026-21643)

CVE-2026-21643 is a critical SQL injection vulnerability in Fortinet FortiClientEMS version 7.4.4, allowing unauthenticated attackers to execute arbitrary code or commands by sending specially crafted HTTP requests. This flaw could be exploited remotely to gain unauthorized access, compromise sensitive data, or take control of the affected system.

CrowdSec has been tracking this vulnerability and its exploits since 15th of April 2026.

CrowdSec network data shows that most actors exploiting CVE-2026-21643 rely on broad, untargeted scans with minimal filtering. The activity is largely automated and opportunistic in nature. CrowdSec data also reveals a clear uptick in attacks involving CVE-2026-21643 over the past week. Activity is above the usual baseline, suggesting growing attention from attackers. This may reflect rising awareness, recent exploit releases, or expanded targeting efforts.

Attackers exploit the /api/v1/init_consts endpoint by injecting malicious SQL commands through the Site HTTP header, enabling unauthenticated SQL injection attempts against FortiClientEMS servers.