The Multi Functional Flexi Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `arv_lb[message]` parameter in all versions up to, and including, 1.2 due to insufficient input sanitization and output escaping. This is due to the `arv_lb_options_val()` sanitize callback returning user input without any sanitization, and the stored `message` value being output in the `genLB()` function without escaping. This makes it possible for authenticated attackers, with Administrator-level access, to inject arbitrary web scripts in pages that will execute whenever a user accesses a page or post with the lightbox enabled.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
High
Admin 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 5
https://plugins.trac.wordpress.org/browser/multi-functional-flexi-lightbox/tags…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/multi-functional-flexi-lightbox/tags…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/multi-functional-flexi-lightbox/trun…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/multi-functional-flexi-lightbox/trun…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/a4c0b14a-d039-4008-a4…
security@wordfence.com