CVE-2025-3662 FancyBox for WordPress < 3.3.6 - Unauthenticated Stored XSS
Unauthenticated attackers can inject malicious scripts via gallery captions in FancyBox for WordPress, potentially leading to code execution or account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-3662?
CVE-2025-3662 is a medium-severity cross-site scripting vulnerability in Unknown FancyBox for WordPress, published on 3 Jun 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
The FancyBox for WordPress plugin before 3.3.6 does not escape captions and titles attributes before using them to populate galleries' caption fields. The issue was received as a Contributor+ Stored XSS, however one of our researcher (Marc Montpas) escalated it to an Unauthenticated Stored XSS
Weakness: CWE-79
Which versions are affected by CVE-2025-3662?
It affects 1 product.
Products include Colorlib Fancybox.
How do I fix CVE-2025-3662?
No fix has been published for CVE-2025-3662 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-2025-3662 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-3662 exists.
Other vulnerabilities in Unknown FancyBox for WordPress
Sources
Also known as GHSA-3q79-wmhj-39pr.