medium · CVSS v3 5.3

CVE-2026-121636

The Quick Event Manager WordPress plugin before version 9.19 fails to verify PayPal payment notifications, allowing attackers to mark event

Overview

The Quick Event Manager WordPress plugin before version 9.19 fails to verify PayPal payment notifications, allowing attackers to mark event registrations as paid without actual payment. This flaw can lead to fraudulent ticketing and revenue loss for event organizers. It is a medium‑severity vulnerability that affects sites using the plugin.

Description

The Quick Event Manager WordPress plugin before 9.19 does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, which could allow unauthenticated attackers to mark registrations as paid without making a payment.

Impact

The integrity of event registration data is compromised, as unauthorized users can falsely mark registrations as paid. This can result in financial loss and loss of trust for event organizers and attendees. The confidentiality of payment status remains intact, and availability is not directly affected.

Remediation

Update the Quick Event Manager plugin to version 9.19 or later. If an update is not immediately possible, disable PayPal IPN processing or implement custom verification of PayPal notifications before marking registrations as paid. Monitor registration logs for anomalous paid status changes and consider temporarily disabling public registration until the patch is applied.

Risk context

With a CVSS v3 score of 5.3 and a medium severity rating, the vulnerability poses a moderate risk. While no EPSS data is available, the potential for financial fraud warrants timely remediation.

Affected products

  • Quick Event Manager
  • WordPress

Scores

Severity
medium
CVSS v2
5
CVSS v3
5.3
CVSS v4
—
EPSS
—

WordPress plugin payment registration medium CVE-2026-121636

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