CVE-2026-6454 Cross-site scripting in Firelight Lightbox
Authenticated contributors can inject arbitrary scripts via PDF href attributes in Firelight Lightbox, leading to stored XSS execution on user interaction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6454?
CVE-2026-6454 is a medium-severity cross-site scripting vulnerability in firelightwp Firelight Lightbox, published on 24 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-6454?
How do I fix CVE-2026-6454?
No fix has been published for CVE-2026-6454 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6454 being exploited?
There is no known exploitation of CVE-2026-6454 in the wild and no public exploit code.
Sources
Also known as GHSA-ccv6-5mc2-jm5q.