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CVE-2026-17089— Events Manager <= 7.4.0.1 - Reflected Cross-Site Scripting via 'header_format' Parameter

Quick assessment

Affected
netweblogic Events Manager – Calendar, Bookings, Tickets, and more!
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Events Manager是WordPress基金会的一款管理活动事件的CMS插件。 WordPress Events Manager 7.4.0.1及之前版本存在跨站脚本漏洞，该漏洞源于对header_format参数输入清理和输出转义不足，且未认证的search_events_grouped AJAX操作完全绕过清理，可能导致未认证攻击者在页面中注入任意Web脚本，诱导用户点击链接执行。

CVSS 6.1 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
netweblogic Events Manager – Calendar, Bookings, Tickets, and more! ≤ 7.4.0.1 affected
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I. Basic Information for CVE-2026-17089

Vulnerability Information
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Vulnerability Title
Events Manager <= 7.4.0.1 - Reflected Cross-Site Scripting via 'header_format' Parameter
Source: CVE Program / CVE List V5
Vulnerability 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().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Events Manager 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Events Manager是WordPress基金会的一款管理活动事件的CMS插件。 WordPress Events Manager 7.4.0.1及之前版本存在跨站脚本漏洞，该漏洞源于对header_format参数输入清理和输出转义不足，且未认证的search_events_grouped AJAX操作完全绕过清理，可能导致未认证攻击者在页面中注入任意Web脚本，诱导用户点击链接执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netweblogic Events Manager – Calendar, Bookings, Tickets, and more! 0 ~ 7.4.0.1 -

II. Public POCs for CVE-2026-17089

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III. Intelligence Information for CVE-2026-17089

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Security Blog Posts for CVE-2026-17089 (1)

Same Patch Batch · netweblogic · 2026-08-25 · 4 CVEs total

CVE-2026-14280 6.6 MEDIUM Events Manager <= 7.3.7.4 - Authenticated (Administrator+) Local File Inclusion via 'dbem_
CVE-2026-15023 6.5 MEDIUM Events Manager <= 7.4.0 - Authenticated (Contributor+) SQL Injection via 'meta_key' Parame
CVE-2026-10627 5.3 MEDIUM Events Manager <= 7.4.0 - Missing Authorization to Unauthenticated Sensitive Information D

IV. Related Vulnerabilities

Same product: Events Manager – Calendar, Bookings, Tickets, and more!
Same vendor: netweblogic
Same weakness: CWE-79

V. Comments for CVE-2026-17089

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