CVE-2016-3978: Fortinet FortiOS

Medium severity, CVSS 6.1. EPSS: 5.9% chance of exploitation in the next 30 days.

The Web User Interface (WebUI) in FortiOS 5.0.x before 5.0.13, 5.2.x before 5.2.3, and 5.4.x before 5.4.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks or cross-site scripting (XSS) attacks via the "redirect" parameter to "login."

Affected products

• Fortinet FortiOS: version 5.0.0 only; version 5.0.1 only; version 5.0.2 only; version 5.0.3 only; version 5.0.4 only; version 5.0.5 only; …

Published 2016-04-08. Last modified 2026-06-17.