CVE-2026-39812
Received Received - Intake
Cross-Site Scripting in Fortinet FortiSandbox Enables Code Execution

Publication date: 2026-04-14

Last updated on: 2026-04-21

Assigner: Fortinet, Inc.

Description
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>
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Meta Information
Published
2026-04-14
Last Modified
2026-04-21
Generated
2026-06-16
AI Q&A
2026-04-14
EPSS Evaluated
2026-06-15
NVD
CVE-2026-39812
EUVD
EUVD-2026-22342
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
fortinet fortisandbox From 4.2.0 (inc) to 4.2.8 (inc)
fortinet fortisandbox_cloud 5.0.4
fortinet fortisandbox From 4.4.0 (inc) to 4.4.9 (exc)
fortinet fortisandbox From 5.0.0 (inc) to 5.0.6 (exc)
fortinet fortisandbox_cloud 5.0.5
fortinet fortisandbox_cloud From 23.3.4329 (inc) to 24.1.4436 (inc)
fortinet fortisandbox_cloud From 22.2.4134 (inc) to 23.1.4260 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability is a cross-site scripting (XSS) issue found in Fortinet FortiSandbox versions 4.2, 4.4.0 through 4.4.8, and 5.0.0 through 5.0.5, including FortiSandbox PaaS versions in the same ranges. It occurs due to improper neutralization of input during web page generation, which means that malicious input is not properly sanitized before being included in web pages.

As a result, an attacker may be able to execute unauthorized code or commands by injecting malicious scripts through the vulnerable input vector.

Impact Analysis

This vulnerability can allow an attacker to execute unauthorized code or commands within the context of the affected web application. This could lead to unauthorized actions being performed, potential data theft, session hijacking, or other malicious activities depending on the privileges of the affected user.

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