CVE-2026-59835 in FortiSandbox
A exposure of resource to wrong sphere vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.3 through 4.4.8 may allow an unauthenticated attacker to access the VNC server of VMs performing scanning via network requests.
Quick answer
Fortinet FortiSandbox should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- FortiSandbox 5.0.0 through 5.0.2
- FortiSandbox 4.4.3 through 4.4.8
Fixed versions
- FortiSandbox 5.0.3 or later
- FortiSandbox 4.4.9 or later
How to fix it
Update FortiSandbox. The old version can expose data, allow unsafe access, or let an attacker run commands.
- Check the exact Fortinet product and branch in use.
- Upgrade to FortiSandbox 5.0.3 or later, FortiSandbox 4.4.9 or later.
- Follow Fortinet upgrade path guidance.
- Limit admin access until the update is done.
Scan now. Google sign-in is only needed to unlock fix guidance.
Verify the fix
- Confirm the Fortinet product reports a fixed version.
- Scan again and confirm CVE-2026-59835 is gone.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-59835?
Fortinet FortiSandbox versions listed as affected should be reviewed: FortiSandbox 5.0.0 through 5.0.2, FortiSandbox 4.4.3 through 4.4.8.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.