XSS vulnerability observed in the authentication replacement pages


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 version 7.0.0 through 7.0.5
FortiOS 6.4 all versions.


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


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