CVE-2026-21643 Fortinet FortiClient EMS SQL Injection

Exploited in the wild Critical 9.1 Published 6 Feb 2026 Updated 14 Apr 2026

Unauthenticated attackers can execute unauthorized code via SQL injection in FortiClient EMS, requiring immediate patching.

Exploited in the wild: Since 13 Apr 2026
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-21643?

CVE-2026-21643 is a critical SQL injection vulnerability in Fortinet FortiClientEMS, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-89

Which versions are affected by CVE-2026-21643?

It affects 1 product.

Products include Fortinet Forticlientems.

How do I fix CVE-2026-21643?

No fix has been published for CVE-2026-21643 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 16 Apr 2026.

Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.

Is CVE-2026-21643 being exploited?

Yes. Attackers have exploited CVE-2026-21643 in the wild since at least 13 Apr 2026.

Public exploit code: 1 Nuclei template and 2 proofs of concept on GitHub.

Sources

Also known as GHSA-r6vr-hwpr-qqch.