CVE-2017-14191 Auth bypass in FortiWeb

What is CVE-2017-14191?

CVE-2017-14191 is a medium-severity authentication bypass vulnerability in Fortinet Fortiweb, published on 20 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Improper Access Control vulnerability in Fortinet FortiWeb 5.6.0 up to but not including 6.1.0 under "Signed Security Mode", allows attacker to bypass the signed user cookie protection by removing the FortiWeb own protection session cookie.

Which versions are affected by CVE-2017-14191?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2017-14191?

No fix has been published for CVE-2017-14191 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2017-14191 being exploited?

There is no known exploitation of CVE-2017-14191 in the wild and no public exploit code.

Other vulnerabilities in Fortinet Fortiweb

• CVE-2025-25257 Fortinet FortiWeb SQL Injection Exploited Critical 9.6
• CVE-2025-64446 Fortinet FortiWeb Path Traversal Exploited Critical 9.4
• CVE-2025-58034 Fortinet FortiWeb OS Command Injection Exploited Medium 6.7
• CVE-2020-29015 SQL injection in Fortinet FortiWeb Critical 9.8
• CVE-2020-29016 Memory corruption in Fortinet FortiWeb Critical 9.8

All Fortinet Fortiweb vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-5xg4-jxh8-j4g8.