Vulnerabilities / Leaky Paywall / WPSEC-2026-2619
Leaky Paywall <= 5.3.2 - Unauthenticated Payment Bypass via Forged PayPal IPN
Medium 5.3
CWE-345Fixed in 5.3.3
- ID
- WPSEC-2026-2619
- Plugin
- Leaky Paywall (leaky-paywall)
- Affected
- from 5.0.8 before 5.3.3
- Remediation
- Update to 5.3.3 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-345
- Usage
- Plugin Low · Affected versions None seen among sites WPSec scans, 2026-11-05
- Attack surface
- Leaky Paywall on WPSec AttackSurface
- Fix released
- Published
Description
The Leaky Paywall plugin for WordPress is vulnerable to a payment bypass via the PayPal Standard IPN listener in versions 5.0.8 up to, and including, 5.3.2. This is due to insufficient verification of data authenticity: when PayPal's verification endpoint did not answer VERIFIED, the plugin fell back to a self-validation that only checked request fields the sender controls (receiver email, payment status, invoice format, amount and the custom email). This makes it possible for unauthenticated attackers to forge PayPal payment notifications and create or activate paid subscriptions without paying.
References
- https://wpsec.com/vuln/WPSEC-2026-2619/
- https://plugins.svn.wordpress.org/leaky-paywall/tags/5.3.3/
- https://wordpress.org/plugins/leaky-paywall/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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