CVE-2026-17089
Events Manager <= 7.4.0.1 - Reflected Cross-Site Scripting via 'header_format' Parameter
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Assigning CNA
- Wordfence
- Evidence observed
- Oct 3, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NLow · next 30 days
- Percentile
- 20.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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().
Sources
Shell PoC for CVE-2026-17089, an unauthenticated reflected XSS in the WordPress Events Manager plugin (<= 7.4.0.1); fingerprints the plugin and tests header_format reflection.
Responsible use
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