XSS vulnerability observed in the authentication replacement pages

Summary

An improper neutralization of input during web page generation ('Cross-site Scripting') [CWE-79] vulnerability in FortiOS may allow an unauthenticated remote attacker to perform a reflected cross site scripting (XSS) attack in the captive portal authentication replacement page.

Affected Products

FortiOS 7.2 all versions are not affected
FortiOS version 7.0.0 through 7.0.5
FortiOS 6.4 all versions
FortiOS 6.2 all versions are not affected
FortiOS 6.0 all versions are not affected

Solutions

Please upgrade to FortiGate version 7.0.6 or above.
Please upgrade to FortiGate version 7.2.0 or above.

Acknowledgement

Fortinet is pleased to thank Hebun İlhanlı from Intertech for reporting this vulnerability under responsible disclosure.

Timeline

2022-07-05: Initial publication