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6.1

FortiOS SSL VPN portal can run attacker script

CVE-2019-5588 · published 7 years ago
Summary

Fortinet FortiOS versions 6.0.0 through 6.0.4 let a specially crafted request to the VPN web page cause the site to run code that an attacker provides. This could let an attacker steal user credentials or perform actions as the logged‑in user. Apply the latest FortiOS update or follow Fortinet’s guidance to sanitize the input and protect the VPN portal.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
fortinet fortios >= 6.0.0, <= 6.0.4
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Original advisory text
A reflected Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4 under SSL VPN web portal may allow an attacker to execute unauthorized malicious script code via the "err" pa...
A reflected Cross-Site-Scripting (XSS) vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4 under SSL VPN web portal may allow an attacker to execute unauthorized malicious script code via the "err" parameter of the error process HTTP requests.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.1 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-79Cross-site Scripting (XSS)
Timeline
Published4 Jun 2019
Updated31 Oct 2026
First seen29 Sep 2026
Sources
CVE-2019-5588 · NVD
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