XSS via back button

Summary

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability [CWE-79] in FortiSandbox may allow an unauthenticated attacker to execute commands via crafted requests.

FortiSandbox PaaS versions 4.4.8 and 5.0.5 contains the fix for this vulnerability.

Version Affected Solution
FortiSandbox 5.0 5.0.0 through 5.0.1 Upgrade to 5.0.2 or above
FortiSandbox 4.4 4.4.0 through 4.4.7 Upgrade to 4.4.8 or above
FortiSandbox 4.2 4.2 all versions Migrate to a fixed release
FortiSandbox 4.0 4.0 all versions Migrate to a fixed release

Acknowledgement

Internally reported and discovered by Jaguar Perlas of Burnaby Infosec team.

Timeline

2026-02-10: Initial publication