On 2026-04-13, CISA added CVE-2026-21643 (Fortinet FortiClient EMS) to its Known Exploited Vulnerabilities (KEV) Catalog [2]. The vulnerability is listed in the catalog as "Fortinet FortiClient EMS SQL Injection Vulnerability" [2]. CISA requires remediation in accordance with vendor mitigation instructions; see the original text in the body for specific requirements [2].
Backfill: this event became public on Apr 13, 2026 and we added it on Nov 10, 2026. It is not a new event.
CISA Adds Fortinet FortiClient EMS Vulnerability CVE-2026-21643 to Known Exploited Vulnerabilities Catalog
1 min read
- Disclosed
- Apr 13, 2026
- Published
- Nov 10, 2026
- Last updated
- Nov 8, 2026
- CVSS basis
- Our assessment
- 97.7%, higher than 100% of CVEs
- Exploitation and patch status
- ExploitedKEV
- Attack vector
- Vulnerability status
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Government, Cross-industry
What to do nowOur advice
CISA requires remediation in accordance with vendor mitigation instructions; see the original text in the body for specific requirements [2]
Timeline
Technical details
CISA KEV Listing Record
On 2026-04-13, CISA added CVE-2026-21643 to the catalog for Fortinet FortiClient EMS [2].
Original Technical Description
Fortinet FortiClient EMS contains a SQL injection vulnerability that may allow an unauthenticated attacker to execute unauthorized code or commands via specifically crafted HTTP requests. [2]
Official Requirements
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. [2]
Individual Vulnerability Record
The U.S. National Vulnerability Database (NVD) provides an independent vulnerability record and description for CVE-2026-21643. [1]
References
Official / primary3
- [1]
“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.”
- [2]
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.