CVE-2026-3347

Description

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.

PUBLISHED Reserved 2026-02-27 | Published 2026-03-21 | Updated 2026-04-08 | Assigner Wordfence

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Timeline

Credits

san6051 finder

References

www.wordfence.com/...-d039-4008-a433-ab3605e2612c?source=cve

plugins.trac.wordpress.org/...flexi-lightbox/tags/1.2/sp.php

plugins.trac.wordpress.org/...-lightbox/tags/1.2/options.php

plugins.trac.wordpress.org/...al-flexi-lightbox/trunk/sp.php

plugins.trac.wordpress.org/...exi-lightbox/trunk/options.php

cve.org (CVE-2026-3347)

nvd.nist.gov (CVE-2026-3347)

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