ZDI-26-266: Fortinet FortiWeb cat_cgi_paths Out-Of-Bounds Write Remote Code Execution Vulnerability
Published Apr 15, 2026
·Updated
This vulnerability allows remote attackers to execute arbitrary code on affected installations of Fortinet FortiWeb. Authentication is required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-40688.
Affected Software
1 affected component
Fortinet FortiWeb
Event History
Apr 15, 2026
Advisory Published
via ZDI·05:00 AM
Data Sourced
via ZDI·05:00 AM
Description
Frequently Asked Questions
1
What is the severity of ZDI-26-266?
The severity of ZDI-26-266 is high due to its potential for remote code execution.
2
How do I fix ZDI-26-266?
To fix ZDI-26-266, ensure that your Fortinet FortiWeb is updated to the latest version released by Fortinet.
3
What type of vulnerability is ZDI-26-266?
ZDI-26-266 is an out-of-bounds write vulnerability that allows remote code execution.
4
Is authentication required to exploit ZDI-26-266?
Yes, authentication is required to exploit the ZDI-26-266 vulnerability.
5
Which software is affected by ZDI-26-266?
The affected software for ZDI-26-266 is Fortinet FortiWeb.