CVE Catalog

CVE-2026-8608

MediumCVSS 5.3
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.17%

6th percentile - higher than 6% of all known CVEs

Summary

The Event Monster plugin for WordPress up to version 2.1.0 has a vulnerability due to insufficient verification of data authenticity. The capture_payment() AJAX handler trusts client-supplied payment data (including transaction ID, amount, and status) without server-side verification against PayPal API or any payment gateway, and without nonce or capability checks. This allows unauthenticated attackers to forge payment records, mark bookings as Completed, and receive confirmation emails with valid QR code tickets without making any payment.

Risk Assessment

An attacker can obtain free QR tickets and booking confirmations, leading to financial loss and integrity compromise of the booking system.

Recommendation

Immediately update the Event Monster plugin to the latest version and implement server-side payment verification.

Related vulnerabilities

Original NVD description (English source)

The Event Monster – Event Management, Events Calendar, Tickets plugin for WordPress is vulnerable to Insufficient Verification of Data Authenticity in versions up to, and including, 2.1.0. This is due to the capture_payment() AJAX handler (registered via wp_ajax_nopriv_em_capture_payment) trusting client-supplied payment data — including transaction ID, amount, and payment status — without performing any server-side verification against the PayPal API or any other payment gateway, and without nonce or capability checks. This makes it possible for unauthenticated attackers to forge payment records, mark bookings as Completed, and obtain confirmation emails containing valid QR code tickets without making any actual payment.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS