CVE-2020-6646 Cross-site scripting in Fortinet FortiWeb

What is CVE-2020-6646?

CVE-2020-6646 is a medium-severity cross-site scripting vulnerability in Fortinet Fortiweb, published on 17 Mar 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

An improper neutralization of input vulnerability in FortiWeb allows a remote authenticated attacker to perform a stored cross site scripting attack (XSS) via the Disclaimer Description of a Replacement Message.

Weakness: CWE-79

Which versions are affected by CVE-2020-6646?

It affects 1 product.

Products include Fortinet Fortiweb.

How do I fix CVE-2020-6646?

No fix has been published for CVE-2020-6646 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2020-6646 being exploited?

There is no known exploitation of CVE-2020-6646 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-7m6g-jmv3-c8cf.