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.
Published: 2026-11-06
Score: 5.3 Medium
EPSS: n/a
KEV: No
Impact: Unauthorized Payment Status Update
Action: Patch Immediately
AI Analysis

Impact

The Quick Event Manager plugin does not verify the authenticity of PayPal payment notifications before marking event registrations as paid, allowing unauthenticated attackers to trigger paid status for registrations without making a payment. This flaw represents a lack of proper authentication and authorization for payment confirmation (CWE‑613 or CWE‑639). The consequence is that users might receive event tickets or access under false pretenses, potentially leading to fraudulent event attendance or revenue loss.

Affected Systems

The vulnerability affects the Quick Event Manager WordPress plugin versions 9.9.5 through 9.18. Users running those versions on any WordPress site are susceptible to the issue.

Risk and Exploitability

The CVSS score of 5.3 indicates a moderate impact, and the EPSS score is not available. The flaw is not listed in the CISA KEV catalog. Attackers can exploit the issue by sending crafted IPN messages containing the 'debug' parameter, bypassing verification. Because the vulnerability requires no authentication to the site, unauthenticated users can trigger the payment status update.

Generated by OpenCVE AI on November 6, 2026 at 08:20 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Quick Event Manager plugin to version 9.19 or later, which adds PayPal IPN verification.
  • Disable or remove the 'debug' query parameter from the plugin configuration to prevent bypass.
  • Ensure PayPal IPN signatures are verified before processing any payment notifications.

Generated by OpenCVE AI on November 6, 2026 at 08:20 UTC.

Tracking

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Advisories

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History

Fri, 06 Nov 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-345

Fri, 06 Nov 2026 08:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-613
CWE-639

Fri, 06 Nov 2026 07:45:00 +0000

Type Values Removed Values Added
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.
Title Quick Event Manager 9.9.5 - 9.18 - Unauthenticated PayPal IPN Verification Bypass via the 'debug' Parameter
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-11-06T11:50:26.062Z

Reserved: 2026-11-03T17:17:40.133Z

Link: CVE-2026-121636

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-06T08:17:20.103

Modified: 2026-11-06T12:17:20.530

Link: CVE-2026-121636

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-06T08:30:15Z

Weaknesses
  • CWE-345

    Insufficient Verification of Data Authenticity

  • CWE-613

    Insufficient Session Expiration

  • CWE-639

    Authorization Bypass Through User-Controlled Key