CVE-2026-4379 firelightwp CVE debrief

Who should care

Administrators and users of the LightPress Lightbox plugin for WordPress should be aware of this vulnerability and take steps to mitigate it. This includes updating the plugin to version 2.3.5 or later, limiting Contributor-level access and above to trusted users, and monitoring for suspicious activity on the WordPress site. Additionally, security teams and vulnerability management teams should review the vulnerability and assess the potential impact on their organization.

Technical summary

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. An authenticated attacker with Contributor-level access and above can inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The vulnerability has a CVSS score of 6.4 and is classified as MEDIUM severity.

Defensive priority

Medium priority due to the CVSS score of 6.4 and the potential for authenticated attackers to inject arbitrary web scripts.

Recommended defensive actions

• Update the LightPress Lightbox plugin to version 2.3.5 or later
• Limit Contributor-level access and above to trusted users
• Monitor for suspicious activity on the WordPress site
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-08T04:17:09.967Z and was last modified on 2026-07-25T10:10:00.167Z. The NVD entry is currently Deferred. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. 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.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.