CVE-2026-21643

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.

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

• 9.1CVSS 3.1, Criticalfrom the CNA (fortinet)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

What to do

• Upgrade to FortiClientEMS version 8.0.0 or above Upgrade to FortiClientEMS version 7.4.5 or aboveCNA solution statement
• Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Timeline

1. 6 Feb 2026 Published
2. 13 Apr 2026 CVE-2026-21643 added to CISA KEV
3. 13 Apr 2026 Added to the CISA KEV catalogue

Weakness

• CWE-89

References

• https://fortiguard.fortinet.com/psirt/FG-IR-25-1142