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CVE-2026-21643

Critical CVSS 9.8 Known exploited

Published 2026-02-06 · last changed 2026-06-17 · added to CISA KEV 2026-04-13

This one is being exploited in the wild.

CISA added CVE-2026-21643 to the Known Exploited Vulnerabilities catalog on 2026-04-13. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-21643, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

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.

Sources

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