Events Manager <= 7.4.0.1 - Reflected Cross-Site Scripting via 'header_format' Parameter
Summary
| CVE | CVE-2026-17089 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-25 04:18:02 UTC |
| Updated | 2026-08-26 16:19:05 UTC |
| 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(). |
Risk And Classification
Primary CVSS: v3.1 6.1 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.002800000 probability, percentile 0.199960000 (date 2026-08-26)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 6.1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
RequiredScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Netweblogic | Events Manager Calendar Bookings Tickets And More! | affected 7.4.0.1 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/em-actions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/a56d1a9e-7564-41b0-af03-c272f... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/em-actions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/em-actions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/classes/em-events.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/classes/em-object.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/classes/em-object.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.3.4/em-actions.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/events-manager/tags/7.4.0.1/classes/em-events.php | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Wordfence PRISM (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-07-24T14:58:56.000Z | Vendor Notified |
| CNA | 2026-08-24T14:30:28.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.