CVE-2025-49940 WordPress Fusion Builder plugin <= 3.13.2 - Cross Site Scripting (XSS) vulnerability
An attacker can execute arbitrary scripts in the victim's browser via DOM-based XSS in the Fusion Builder plugin for WordPress.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-49940?
CVE-2025-49940 is a medium-severity cross-site scripting vulnerability in ThemeFusion Fusion Builder, published on 22 Oct 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in ThemeFusion Fusion Builder fusion-builder allows DOM-Based XSS.This issue affects Fusion Builder: from n/a through <= 3.13.2.
Weakness: CWE-79
Which versions are affected by CVE-2025-49940?
How do I fix CVE-2025-49940?
No fix has been published for CVE-2025-49940 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-2025-49940 being exploited?
There is no known exploitation of CVE-2025-49940 in the wild and no public exploit code.
Sources
Also known as GHSA-fq5h-3m7r-254w.