CVE-2026-6454
Received Received - Intake

Stored DOM XSS in Firelight Lightbox WordPress Plugin

Publication date: 2026-07-24

Last updated on: 2026-07-24

Assigner: Wordfence

Description
The Firelight Lightbox plugin for WordPress is vulnerable to Stored DOM Cross-Site Scripting in versions up to and including 2.3.20. This is due to insufficient sanitization of the href attribute value within the FancyBox V2 PDF beforeLoad JavaScript callback generated in inc/fancybox-2.php, where this.href is string-concatenated directly into an HTML string without escaping, allowing a stored href containing entity-encoded double-quotes to break out of the data attribute and inject arbitrary event handlers into the DOM. This makes it possible for authenticated attackers with contributor-level access and above to inject arbitrary web scripts into pages that execute whenever a user clicks the malicious PDF link.

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Meta Information

Published
2026-07-24
Last Modified
2026-07-24
Generated
2026-07-24
AI Q&A
2026-07-24
EPSS Evaluated
N/A
NVD
CVE-2026-6454
EUVD
EUVD-2026-48462

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
firelight lightbox to 2.3.20 (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 Firelight Lightbox plugin for WordPress has a stored DOM Cross-Site Scripting (XSS) vulnerability in versions up to 2.3.20. It occurs because the href attribute value in the FancyBox V2 PDF beforeLoad JavaScript callback is not properly sanitized. An attacker can inject malicious scripts by exploiting this to break out of the data attribute and add arbitrary event handlers to the DOM.

Detection Guidance

Check WordPress plugins for the Firelight Lightbox plugin version 2.3.20 or lower. Inspect JavaScript files for the FancyBox V2 PDF beforeLoad callback in inc/fancybox-2.php. Look for unsanitized href attribute values that may contain event handlers.

Impact Analysis

Authenticated attackers with contributor-level access or higher can inject malicious web scripts into pages. These scripts execute when users click a malicious PDF link, potentially stealing user data, session cookies, or performing actions on behalf of the user.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's data protection principles or HIPAA's security requirements. It may result in data breaches, non-compliance penalties, and reputational damage for organizations handling sensitive user data.

Mitigation Strategies

Update the Firelight Lightbox plugin to the latest version. If an update is unavailable, disable the plugin immediately. Review and sanitize href attributes in JavaScript callbacks. Restrict contributor-level access to prevent exploitation.

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