Description
The Firelight Lightbox plugin for WordPress is vulnerable to Stored DOM Cross-Site Scripting in versions up to and including 2.3.20. This is due to insufficient sanitization of the href attribute value within the FancyBox V2 PDF beforeLoad JavaScript callback generated in inc/fancybox-2.php, where this.href is string-concatenated directly into an HTML string without escaping, allowing a stored href containing entity-encoded double-quotes to break out of the data attribute and inject arbitrary event handlers into the DOM. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user clicks the malicious PDF link.
References8
- plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fa…
- plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fa…
- plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/in…
- plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox…
- plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox…
- plugins.trac.wordpress.org/browser/easy-fancybox/trunk/inc/fanc…
- plugins.trac.wordpress.org/changeset?reponame=&old=3610643%40ea…
- www.wordfence.com/threat-intel/vulnerabilities/id/8396c124-9c72…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 30 · as of 14 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.