Capacity to forge authentication cookies

Summary

A reliance on cookie without validation or integrity checking vulnerability [CWE-565] in FortiWeb may allow an unauthenticated attacker to execute arbitrary operations on the system via crafted HTTP or HTTPS request via forged cookies requiring knowledge of the FortiWeb serial number.
FortiAppSec Cloud is NOT impacted by this vulnerability.

Version Affected Solution
FortiWeb 8.0 8.0.0 through 8.0.1 Upgrade to 8.0.2 or above
FortiWeb 7.6 7.6.0 through 7.6.5 Upgrade to 7.6.6 or above
FortiWeb 7.4 7.4.0 through 7.4.10 Upgrade to 7.4.11 or above
FortiWeb 7.2 7.2.0 through 7.2.11 Upgrade to 7.2.12 or above
FortiWeb 7.0 7.0.0 through 7.0.11 Upgrade to 7.0.12 or above

Acknowledgement

Internally discovered by Fortiweb development team. Fortinet is also pleased to thank Jason McFadyen of Trend Research for reporting this vulnerability under responsible disclosure.

Timeline

2025-12-09: Initial publication