CVE-2026-59835: Unauthenticated VNC access exposed on all interfaces

Published Jul 14, 2026
·
Updated

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.

Other sources

An Exposure of Resource to Wrong Sphere vulnerability [CWE-668] in FortiSandbox may allow an unauthenticated attacker to access the VNC server of VMs performing scanning via network requests.

— FortiGuard

Affected Software

4 affected componentsFixes available
Fortinet FortiSandbox>=5.0.0<=5.0.2
Fortinet FortiSandbox>=4.4.3<=4.4.8
Fortinet FortiSandbox>=4.4.3<4.4.9
Fortinet FortiSandbox>=5.0.0<5.0.3

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Fortinet FortiSandbox to a version that resolves this vulnerability.

    Fixed in 4.4.9
  2. Upgrade

    Upgrade Fortinet FortiSandbox to a version that resolves this vulnerability.

    Fixed in 5.0.3

Event History

Jul 14, 2026
Advisory Published
via FortiGuard·12:00 AM
Data Sourced
via FortiGuard·12:00 AM
DescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·03:12 PM
Data Sourced
via MITRE·03:12 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·04:17 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-59835?

The severity of CVE-2026-59835 is high with a CVSS score of 8.6.

2

How do I fix CVE-2026-59835?

To fix CVE-2026-59835, update Fortinet FortiSandbox to version 5.0.3 or later.

3

What systems are affected by CVE-2026-59835?

CVE-2026-59835 affects Fortinet FortiSandbox versions 5.0.0 through 5.0.2 and 4.4.3 through 4.4.8.

4

What type of vulnerability is CVE-2026-59835?

CVE-2026-59835 is classified as an Exposure of Resource to Wrong Sphere vulnerability.

5

What impact does CVE-2026-59835 have on security?

CVE-2026-59835 allows unauthenticated attackers to access the VNC server of virtual machines, potentially compromising sensitive information.

Company

Resources

Contact

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CVE-2026-59835 - Unauthenticated VNC access exposed on all interfaces - SecAlerts