Event Monster <= 2.1.0 - Unauthenticated Insufficient Verification of Data Authenticity to Payment Bypass via em_capture_payment AJAX Action
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Event Monster – Event Manager, Event Booking, Event Ticket & Registration | <= 2.1.0 | 2.2.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-345- Platform
- WordPress
- Package
Event Monster – Event Manager, Event Booking, Event Ticket & Registration- Disclosed
- 05.06.2026
- Updated
- 11.10.2026 10:23
Sources and licenses
Wordfence Intelligence - daddfbd2-cff4-4caa-bbdc-9945a635a1d6 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Event Monster – Event Manager, Event Booking, Event Ticket & Registration
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 8
- First → latest
- 05.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 4
Disclosures per year
- 2019: 1
- 2020: 0
- 2021: 0
- 2022: 2
- 2023: 1
- 2024: 2
- 2025: 1
- 2026: 1
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Event Monster <= 2.1.0 - Unauthenticated Insufficient Verification of Data Authenticity to Payment Bypass via em_capture_payment AJAX Action this entry
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