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Medium · 6.1 Public exploit CVE-2026-17089 EUVD-2026-65277GHSA-gg76-jx66-hjq8

Events Manager <= 7.4.0.1 - Reflected Cross-Site Scripting via 'header_format' Parameter

Published Aug 25, 2026 · Updated Aug 25, 2026 · Assigned by Wordfence

Vendor: netweblogic Product: Events Manager – Calendar, Bookings, Tickets, and more! Category: Web / CMS

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().

Affected products

VendorProductAffectedFixed
netweblogic Events Manager – Calendar, Bookings, Tickets, and more! ≤ 7.4.0.1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References