CVE-2026-4379: Firelightwp Lightpress Lightbox

Medium severity, CVSS 6.4. EPSS: 0.3% chance of exploitation in the next 30 days.

The LightPress Lightbox plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `group` attribute in the `[gallery]` shortcode in all versions up to, and including, 2.3.4. This is due to the plugin modifying gallery shortcode output to include the `group` attribute value without proper escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Affected products

• Firelightwp Lightpress Lightbox: up to and including 2.3.4

Published 2026-04-08. Last modified 2026-07-25.