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CVE-2026-39808

Critical CVSS 9.8 Known exploited

Published 2026-04-14 · last changed 2026-07-17 · added to CISA KEV 2026-07-16

This one is being exploited in the wild.

CISA added CVE-2026-39808 to the Known Exploited Vulnerabilities catalog on 2026-07-16. 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-2026-39808, 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

A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via <insert attack vector here>

Sources

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