CVE entry · CVE-2026-21643
CVE-2026-21643: Fortinet FortiClient EMS SQL Injection Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on April 13, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: April 16, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Fortinet FortiClient EMS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (fortiguard.fortinet.com)
- NVD entry (NIST)
- CISA KEV catalog
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Fortinet Multiple Products Path Traversal Vulnerability
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Fortinet FortiMail Path Traversal Vulnerability
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Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
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Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
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Fortinet FortiSandbox OS Command Injection Vulnerability
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Fortinet FortiSandbox OS Command Injection Vulnerability