VulnerabilityAnalyzed

CVE-2026-21643

Fortinet FortiClient EMS SQL Injection Vulnerability

KEVCRITICAL 9.8EPSS 94.1%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 16 April 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

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.

CVSS 3.1: 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 94.08% probability · 100th percentile
CISA KEV: Listed 13 April 2026 · due 16 April 2026
Weakness: CWE-89
Affected: fortinet/forticlientems
Source: psirt@fortinet.com

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://fortiguard.fortinet.com/psirt/FG-IR-25-1142 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21643

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-1142Vendor Advisory
https://github.com/0xBlackash/CVE-2026-21643/blob/main/cve-2026-21643.pyExploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21643US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.