CVE-2026-3347: Arevico Multi Functional Flexi Lightbox

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Arevico Multi Functional Flexi Lightbox: up to and including 1.2

Published 2026-03-21. Last modified 2026-06-17.