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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 8
https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fancybox/2…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fancybox/2…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/inc/fancyb…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox/2.2.0/j…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox/2.2.0/j…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/inc/fancybox-2.p…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset?reponame=&old=3610643%40easy-fancy…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/8396c124-9c72-4801-89…
security@wordfence.com