CVE-2026-21643: Fortinet FortiClient EMS SQL Injection Vulnerability

Vulnerability summary

CVE-2026-21643 is a critical (CVSS 9.8) SQL Injection vulnerability in Fortinet FortiClient EMS. It is known to be exploited: CISA lists it, first on 13-04-2026. EPSS estimates a 93.87% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 06-02-2026
   PublishedVulnerability first disclosed.
2. 13-04-2026
   Added to CISA KEVFortinet FortiClient EMS SQL Injection Vulnerability
3. 14-04-2026
   Last modifiedVulnerability information updated.
4. 16-04-2026
   CISA remediation dueApply mitigations per vendor instructions.

Description

An improper neutralization of special elements used in an sql command ('sql injection') vulnerability in Fortinet FortiClientEMS 7.4.4 may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests.

• CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.