Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 73.6%; technical severity is CVSS 9.8.
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox Cloud 5.0.4 through 5.0.5, FortiSandbox PaaS 5.0.4 through 5.0.5 may allow an unauthenticated attacker to execute unauthorized commands via specifically crafted HTTP requests
Who should care
- Teams operating Fortisandbox, Fortisandbox Cloud, Fortisandbox Paas
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Fortisandbox, Fortisandbox Cloud, Fortisandbox Paas is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Fortinet Security advisory FG IR 26 141
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-78
- Affected versions
- Fortinet Fortisandbox (Start Including 4.2.0, End Including 4.2.8 | Start Including 4.4.0, End Excluding 4.4.9 | Start Including 5.0.0, End Excluding 5.0.6); Fortinet Fortisandbox Cloud (Start Including 5.0.4, End Excluding 5.0.6); Fortinet Fortisandbox Paas (Start Including 5.0.4, End Excluding 5.0.6)
- Fixed versions
- Fortinet Fortisandbox (Fixed from 4.4.9, 5.0.6); Fortinet Fortisandbox Cloud (Fixed from 5.0.6); Fortinet Fortisandbox Paas (Fixed from 5.0.6)
- Published
- 9 June 2026
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 73.6%
- Signal calculated at 82