firelightwp Firelight Lightbox Plugin up to 2.3.20 on WordPress JavaScript Callback inc/fancybox-2.php beforeLoad href cross site scripting

Summaryinfo

A vulnerability has been found in firelightwp Firelight Lightbox Plugin up to 2.3.20 and classified as problematic. This vulnerability affects the function beforeLoad of the file inc/fancybox-2.php of the component JavaScript Callback Handler. The manipulation of the argument href leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-6454. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in firelightwp Firelight Lightbox Plugin up to 2.3.20 and classified as problematic. This issue affects the function beforeLoad of the file inc/fancybox-2.php of the component JavaScript Callback Handler. The manipulation of the argument href with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at wordfence.com. The identification of this vulnerability is CVE-2026-6454 since 04/16/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:inc/fancybox-2.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• firelightwp

Name

• Firelight Lightbox Plugin

Version

• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4
• 2.3.5
• 2.3.6
• 2.3.7
• 2.3.8
• 2.3.9
• 2.3.10
• 2.3.11
• 2.3.12
• 2.3.13
• 2.3.14
• 2.3.15
• 2.3.16
• 2.3.17
• 2.3.18
• 2.3.19
• 2.3.20

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Entryinfo

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