Is CVE-2026-39812 being actively exploited?

CVE-2026-39812 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-39812?

CVE-2026-39812 has a CVSS 3.1 base score of 4.8 (MEDIUM).

CVE-2026-39812

MEDIUM · CVSS 4.8EPSS 0.2%EU EUVD

A improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSandbox 5.0.0 through 5.0.5, FortiSandbox 4.4.0 through 4.4.8, FortiSandbox 4.2 all versions, FortiSandbox PaaS 5.0.0 through 5.0.5, FortiSandbox PaaS 4.4.0 through 4.4.8, FortiSandbox PaaS 4.2 all versions may allow attacker to execute unauthorized code or commands via <insert attack vector here>

Key facts

CVSS score: 4.8 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
EPSS score: 0.2% (14th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-22342)
Published: April 14, 2026
NVD last modified: June 17, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-22342 in the EU Vulnerability Database. Last updated in EUVD on April 14, 2026.

View on the EU Vulnerability Database

Affected products

fortinet / fortisandbox
fortinet / fortisandbox cloud
fortinet / fortisandbox cloud
fortinet / fortisandbox cloud

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-26-110(Vendor Advisory)

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

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