CVE-2026-21643
Fortinet FortiClient EMS SQL Injection Vulnerability
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
- 97.73% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 13 April 2026 · due 16 April 2026
- Weakness
- CWE-89
- Affected
- fortinet/forticlientems
- Source
- psirt@fortinet.com
EPSS moved from 97.7% on 25 October 2026 to 97.7% on 30 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.