CVE-2026-39808KEV · OVERDUECWE-78

Fortinet FortiSandbox OS Command Injection Vulnerability

Critical · published April 14, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it critical at 9.1. It is confirmed in active exploitation. It sits in the 98.8th percentile for exploit probability.

97
days past CISA
deadline
CVSS v3.1
9.1
EPSS
47%
Percentile
98.8
In the wild
Confirmed
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>

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.47362 · 98.8th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-04-14T15:38Z
KEV added
2026-07-16 · due 2026-07-19
EPSS history
Timeline
  • 25 SEP 03:25Z
    EPSS moved 93% → 47%
    epss
  • 16 JUL 00:00Z
    Added to CISA KEV — remediate by Jul 19
    kev
  • 14 APR 15:38Z
    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…
    cvelistv5