Fortinet FortiSandbox/FortiSandbox PaaS up to 4.2.8/4.4.8/5.0.4 cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in Fortinet FortiSandbox and FortiSandbox PaaS up to 4.2.8/4.4.8/5.0.4. This impacts an unknown function. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-39812. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Fortinet FortiSandbox and FortiSandbox PaaS up to 4.2.8/4.4.8/5.0.4 and classified as problematic. This issue affects some unknown processing. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

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

The advisory is shared at fortiguard.fortinet.com. The identification of this vulnerability is CVE-2026-39812 since 04/07/2026. The exploitation is known to be easy. The attack may be initiated remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1094). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

• Fortinet FortiSandbox

Productinfo

Vendor

• Fortinet

Name

• FortiSandbox
• FortiSandbox PaaS

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4
• 4.2.5
• 4.2.6
• 4.2.7
• 4.2.8
• 4.4.0
• 4.4.1
• 4.4.2
• 4.4.3
• 4.4.4
• 4.4.5
• 4.4.6
• 4.4.7
• 4.4.8
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4

License

• commercial

Website

• Vendor: https://www.fortinet.com/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

CVSSv3info

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Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion