CVE-2026-21643
CriticalExploitedPublic exploitAn 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.
Published Apr 6, 2026 · Updated Apr 14, 2026 · Also known as TR-26-0088
Key Facts
Patch immediately- CVE-2026-21643 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting FortiClientEMS (Fortinet).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 28, 2026 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 94% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
94%
Higher than 99.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-21643 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Apr 13, 2026 | Apr 16, 2026 | Not reported |
| Industry KEV feed | Mar 28, 2026 | Apr 16, 2026 | Known |
| CIRCL KEV | Apr 4, 2026 | Apr 16, 2026 | Not reported |
| ENISA EUVD | Apr 13, 2026 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiClientEMSFortinet | 7.4.4 | n/a |
Timeline
Added to Industry KEV feed
Mar 28, 2026
Added to CIRCL KEV
Apr 4, 2026
Publicly disclosed
Apr 6, 2026
Added to CISA KEV
Apr 13, 2026
Added to ENISA EUVD
Apr 13, 2026
Last updated
Apr 14, 2026
Weakness Type
- CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
References
- advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-25-1142
- advisoryhttps://tr.linkedin.com/pulse/fortinet-forticlientems-i%C3%A7in-kritik-sql-injection-cve-2026-21643-dpqhf
- advisoryUSOM advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: FortiClientEMS (Fortinet) versions 7.4.4. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Mar 28, 2026 and is known to be used in ransomware campaigns.
Yes. It was added on Apr 13, 2026 with a federal remediation due date of Apr 16, 2026.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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