CVE-2026-59835: fortisandbox Resource Exposure — Fix

Description

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.

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CVSS v3.1 Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

EPSS — Exploit Prediction

0.0046

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor	Product	Versions
fortinet	fortisandbox	4.4.3 — 4.4.9
fortinet	fortisandbox	5.0.0 — 5.0.3

References

Advisories & Patches

https://fortiguard.fortinet.com/psirt/FG-IR-26-145

Frequently Asked Questions

What is CVE-2026-59835? +

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. It has a CVSS v3.1 base score of 8.6 (HIGH).

How severe is CVE-2026-59835? +

CVE-2026-59835 has a CVSS v3.1 score of 8.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-59835? +

CVE-2026-59835 affects products from fortinet, specifically: fortisandbox. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-59835? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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