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CVE-2026-25089

Covered in 2 issues

criticalCVSS 9.1

FortiSandbox (versions 5.0.0–5.0.5 and 4.4.0–4.4.8)

FortiSandbox is a security tool made by Fortinet that analyses suspicious files and web content in an isolated environment to detect malware before it reaches a network.

Reported in Issue #4 — The AI Too Dangerous to Release Publicly

Root Cause

The web UI fails to properly neutralise special characters in HTTP request inputs — a weakness classified as CWE-78 (improper neutralisation of special elements used in OS commands). When the application passes unsanitised user input directly to the underlying operating system, an attacker can inject their own commands alongside the intended ones.

Attack Vector

An attacker sends a crafted HTTP request to the FortiSandbox web interface — no credentials, no prior access, no social engineering required. The server processes the malicious input as a legitimate OS command, handing the attacker execution capability on the system. From there, they can move laterally (spreading through connected systems on the same network), exfiltrate (copy out) data, or establish persistent access.

Detection Notes

Look for unexpected outbound connections from FortiSandbox hosts, unusual process spawning in system logs, or HTTP requests containing shell metacharacters (characters like ;, |, or &&) in web server access logs.

Recommended Actions

  1. Upgrade FortiSandbox to version 5.0.6 or above; FortiSandbox 4.4.x users should upgrade to 4.4.9 or above.
  2. Restrict web UI access to trusted internal IP ranges only — do not expose the management interface to the public internet.
  3. Review FortiSandbox logs for anomalous HTTP requests prior to patching.
criticalCVSS 9.1

Fortinet FortiSandbox (versions 5.0.0–5.0.5, 4.4.0–4.4.8, all 4.2 versions, and FortiSandbox Cloud/PaaS 5.0.4–5.0.5)

A Fortinet security product that analyses suspicious files and network traffic in an isolated environment to detect malware before it reaches the rest of a network.

Reported in Issue #38 — Fairlife's Milk Machines Are Offline

Root Cause

The software fails to properly sanitise user-supplied input before passing it to underlying system functions. Think of it like a form that accepts your name but also accidentally runs anything you type as a terminal command.

Attack Vector

An attacker sends a crafted HTTP request to the FortiSandbox interface — no credentials, no user interaction needed. The system processes the malicious input as a command and executes it with elevated privileges.

Recommended Actions

  1. Upgrade to FortiSandbox 4.4.9 or 5.0.6 immediately.
  2. If running cloud or PaaS versions without an available patch, discontinue use until patched.
  3. Restrict external access to the FortiSandbox management interface at the network level.
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