Background exploitation KEV catalog No authentication

CVE-2026-21643

Fortinet FortiClient EMS SQL Injection Vulnerability

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…

CheckOps priority index

9.0/10 Patch within 24 h

Severity9.1

Probability9.8

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 97.7% higher than 99.9% of CVEs

CVSS 3.1 9.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 204 days 13 Apr 2026

CISA due date 16 Apr 2026 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)13 Apr 2026
Exploited in EUVD (ENISA)13 Apr 2026
Used by ransomwareno
EPSS above 10 %97.7%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

Affected products

FortiClientEMSFortiClient EMS

Affected versions

7.4.4

Weaknesses (CWE)

CWE-89

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

06 Feb 2026
Published
13 Apr 2026
Exploitation reported (ENISA)
13 Apr 2026
Added to the KEV catalog
16 Apr 2026
CISA remediation due date
25 Oct 2026
EPSS peak: 97.7%

References

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