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CVE-2026-17089

6.1 · MEDIUM

The Events Manager – Calendar, Bookings, Tickets, and more!

Published Aug 25, 2026CWE-79EPSS 0.41%

Overview

CVE-2026-17089 is a medium-severity vulnerability. It was published on August 25, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

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().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refplugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/classes/em-events.php#L469Refplugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/classes/em-object.php#L1176Refplugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/em-actions.php#L891Refplugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/em-actions.php#L920Refplugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/classes/em-events.php#L469Refplugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/classes/em-object.php#L1176Refplugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/em-actions.php#L891Refplugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/em-actions.php#L920Refplugins.trac.wordpress.org/changeset?old_path=/events-manager/tags/7.4.0.1&new_path=/events-manager/tags/7.4.1Refwww.wordfence.com/threat-intel/vulnerabilities/id/a56d1a9e-7564-41b0-af03-c272ffbbbb97?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-17089?

CVE-2026-17089 is a medium-severity vulnerability. It was published on August 25, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-17089?

This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-17089?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-17089?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-17089 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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