What the vulnerability does
01Description
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.
Explanation of Vulnerability in Simple Terms
02Summary
Multi Functional Flexi Lightbox versions 1.2 and earlier contain a cross-site scripting vulnerability. An attacker with high-level privileges can inject malicious scripts that execute in other users' browsers, potentially affecting site visitors across the platform. The vulnerability requires administrative or equivalent access to exploit.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that run in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
An admin or high-privilege user could inject scripts affecting all site visitors, compromising user data or site functionality.
Conditions required to exploit
05Prerequisites
Attacker must have high-level administrative privileges on the site.
Key dates
06Disclosure timeline
March 21, 2026
CVE published
April 8, 2026
Record updated
