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CVE-2026-39813

Fortinet Fortisandbox path traversal

9.8 CRITICALEPSS 0.72%
  1. Published14 Apr 2026

Description

A path traversal: '../filedir' vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8 may allow attacker to escalation of privilege via specially crafted HTTP requests.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet Fortisandbox≥ 4.4.0 < 4.4.9 · ≥ 5.0.0 < 5.0.6

Remediation

Fixed in
Fortinet Fortisandbox≥ 4.4.9

References

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Frequently asked

Is CVE-2026-39813 being actively exploited?

CVE-2026-39813 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.72%.

How severe is CVE-2026-39813?

CVE-2026-39813 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.72% probability of exploitation.

Which products are affected by CVE-2026-39813?

Affected products include Fortinet Fortisandbox.

How do I fix CVE-2026-39813?

Upgrade affected software to a fixed version, for example Fortinet Fortisandbox 4.4.9 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39813 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.