CVE-2025-3662: FancyBox for WordPress < 3.3.6 - Unauthenticated Stored XSS

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-06-03 · updated 2026-06-17
Weakness: CWE-79

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

Affected products

colorlibplugins FancyBox for WordPress: before 3.3.6 — fixed in 3.3.6

How to fix

Upgrade to a fixed version: colorlibplugins FancyBox for WordPress 3.3.6. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/4cda12f0-3c23-44ad-80ea-db2443ebcf82/
https://wpscan.com/vulnerability/4cda12f0-3c23-44ad-80ea-db2443ebcf82/

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