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Cyber Security Agency of Singapore
Alerts

Critical Vulnerability in Fortinet FortiSandbox

12 June 2026

Attackers can exploit a critical vulnerability in Fortinet FortiSandbox via HTTP requests to execute unauthorised commands on the affected system. Patch immediately.

Background

Fortinet has released security updates to address a critical OS command injection vulnerability (CVE-2026-25089) affecting FortiSandbox, FortiSandbox Cloud, and FortiSandbox PaaS. This vulnerability has a Common Vulnerability Scoring System (CVSS v3.1) score of 9.8 out of 10.

Impact

Due to improper neutralisation of special elements used in OS commands in the FortiSandbox Web UI, an unauthenticated attacker could send specially crafted HTTP requests to execute unauthorised commands on the affected system.

Affected Products

These vulnerabilities affect the following Fortinet FortiSandbox products and versions:

  • All versions of FortiSandbox 4.2

  • FortiSandbox versions 4.4.0 through 4.4.8

  • FortiSandbox versions 5.0.0 through 5.0.5

  • FortiSandbox Cloud versions 5.0.4 through 5.0.5

  • FortiSandbox PaaS versions 5.0.4 through 5.0.5

Mitigation

Users and administrators of affected products are advised to update to the latest versions immediately.

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-141 (opens in new tab)

https://nvd.nist.gov/vuln/detail/CVE-2026-25089 (opens in new tab)