Is CVE-2026-39813 being actively exploited?

CVE-2026-39813 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-39813?

CVE-2026-39813 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-39813

CRITICAL · CVSS 9.8EPSS 0.7%EU EUVD

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.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-24
EPSS score: 0.7% (53th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-22344)
Published: April 14, 2026
NVD last modified: June 18, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-22344 in the EU Vulnerability Database. Last updated in EUVD on June 18, 2026.

View on the EU Vulnerability Database

Affected products

fortinet / fortisandbox

Certified products that may be affected

1 FIPS 140 or Common Criteria certified product, from automated matching by sec-certs.org.

FortiSandbox 4.4 - Fortinet, Inc. - Common Criteria CCEVS-VR-VID-11636-2025 - active

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-112(Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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