CVE-2026-6454
What it 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.
At a glance
- Exploitability
- Can be exploited over the network with a low-privilege account. Limited direct impact.
- Exploit odds
- 0.4% chance of exploitation in the next 30 days (EPSS).
- Fix
- No patch or advisory is linked yet. Look at mitigations or restrict exposure.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.4% in the next 30 days (EPSS).
- Severity: 6.4 MEDIUM (CVSS).
- Fix: none linked yet, which raises it.
Details
- Published
- Last modified
- Exploit probability
- 0.4% · EPSS, next 30 days
- Weakness
- CWE-79 · Cross-site scripting
- Record status
- Deferred
Attack profile CVSS 3.1 · 6.4
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Raw vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-6454.md and follow it. Check whether this project is affected by CVE-2026-6454. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
References
- https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fancybox/2.2.0/jquery.fancybox.js#L1235
- https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/fancybox/2.2.0/jquery.fancybox.js#L280
- https://plugins.trac.wordpress.org/browser/easy-fancybox/tags/2.3.18/inc/fancybox-2.php#L322
- https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox/2.2.0/jquery.fancybox.js#L1235
- https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/fancybox/2.2.0/jquery.fancybox.js#L280
- https://plugins.trac.wordpress.org/browser/easy-fancybox/trunk/inc/fancybox-2.php#L322
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3610643%40easy-fancybox&new=3610643%40easy-fancybox
- https://www.wordfence.com/threat-intel/vulnerabilities/id/8396c124-9c72-4801-8964-1cd5fbd52d20?source=cve