Medium [CVE-2026-39812] Multiple Stored XSS
This medium-severity Fortinet advisory covers CVE-2026-39812 affecting FortiSandbox.
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Summary
CVSSv3 Score:
4.3
An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] in FortiSandbox and FortiSandbox Cloud may allow a privileged attacker to perform a stored XSS attack via crafted HTTP requests.
Revised on 2026-04-14 00:00:00
- FortiSandbox 5.0: 5.0.0 through 5.0.5
- FortiSandbox 4.4: 4.4.0 through 4.4.8
- FortiSandbox 4.2: 4.2 all versions
- FortiSandbox PaaS 5.0: 5.0.0 through 5.0.5
- FortiSandbox PaaS 4.4: 4.4.0 through 4.4.8
- FortiSandbox PaaS 4.2: 4.2 all versions
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- FortiSandbox 5.0: 5.0.6
- FortiSandbox 4.4: 4.4.9
- FortiSandbox 4.2: migrate to a fixed release
- FortiSandbox PaaS 5.0: 5.0.6
- FortiSandbox PaaS 4.4: 4.4.9
- FortiSandbox PaaS 4.2: migrate to a fixed release
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Upgrade per the Affected/Solution table: FortiSandbox 5.0: 5.0.6; FortiSandbox 4.4: 4.4.9; FortiSandbox 4.2: migrate to a fixed release; FortiSandbox PaaS 5.0: 5.0.6; FortiSandbox PaaS 4.4: 4.4.9; ….
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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