Events Manager permits unauthenticated reflected cross-site scripting

Events Manager through 7.4.0.1 lets an unauthenticated attacker supply a malicious header_format value to the search_events_grouped AJAX action. That path bypasses the shortcode's wp_kses() handling and output_grouped() echoes the value into the HTML body, causing script execution when a victim follows a crafted link.

CVE / CNA score 6.1 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Events Manager – Calendar, Bookings, Tickets, and more!
Plugin slug: events-manager
Affected: <= 7.4.0.1
Safe version: 7.4.1
Published: Aug 25, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Aug 25, 2026 and is one of 46 known issues for this plugin.

What to do

Update, patch or deactivate.

Update to 7.4.1 or later and invalidate privileged sessions if a crafted grouped-event link was opened.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The Events Manager – Calendar, Bookings, Tickets, and more! plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'header_format' parameter in all versions up to, and including, 7.4.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. The shortcode entry point sanitizes 'header_format' via wp_kses(), but the unauthenticated 'search_events_grouped' AJAX action bypasses this sanitization entirely, leaving the parameter unsanitized before it is echoed into the HTML body in output_grouped().

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

Primary and upstream sources

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