CVE-2026-3347
Received Received - Intake
Stored XSS in Multi Functional Flexi Lightbox WordPress Plugin

Publication date: 2026-03-21

Last updated on: 2026-03-21

Assigner: Wordfence

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.
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Meta Information
Published
2026-03-21
Last Modified
2026-03-21
Generated
2026-06-16
AI Q&A
2026-03-21
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3347
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
arv multi_functional_flexi_lightbox to 1.2 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

The Multi Functional Flexi Lightbox plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in all versions up to and including 1.2. This vulnerability arises because the plugin does not properly sanitize or escape user input in the `arv_lb[message]` parameter. Specifically, the sanitize callback `arv_lb_options_val()` returns user input without sanitization, and the stored message is output in the `genLB()` function without escaping. As a result, an authenticated attacker with Administrator-level access can inject malicious scripts that execute whenever a user views a page or post with the lightbox enabled.

Impact Analysis

This vulnerability can allow an attacker with Administrator privileges to inject arbitrary web scripts into pages or posts that use the lightbox feature. These scripts will execute in the browsers of users who visit those pages, potentially leading to theft of sensitive information, session hijacking, or other malicious actions. Since the attack requires Administrator-level access, it could be used to escalate damage within a compromised WordPress site.

Compliance Impact

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