CVE-2026-9242
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk14th percentile — higher than 14% of all known CVEs
Summary
The RegistrationMagic plugin for WordPress up to version 6.0.8.6 contains an authentication bypass vulnerability due to insufficient data authenticity verification in the PayPal IPN handler. The handler is accessible to unauthenticated users and updates the database before IPN validation, allowing an attacker to forge an IPN request, overwrite the user ID in a payment log, and then obtain authentication cookies for any user, including administrators.
Risk Assessment
The risk is critical – an unauthenticated attacker can take over an administrator account, leading to full site compromise, including data theft, malware installation, and defacement.
Recommendation
Immediately update the RegistrationMagic plugin to the latest available version. If an update is not possible, temporarily disable the plugin or restrict access to the PayPal IPN endpoint to trusted IP addresses.
Original NVD description (English source)
The RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to Authentication Bypass via Insufficient Verification of Data Authenticity in all versions up to and including 6.0.8.6. This is due to the PayPal IPN `callback` handler being registered as a nopriv AJAX action with no authentication or nonce requirement, and critically because the handler updates the payment log database row with attacker-controlled POST data — including `payment_status` and the `custom` field encoding the target `user_id` — before PayPal IPN validation is performed, meaning the database remains poisoned even when validation subsequently fails. This makes it possible for unauthenticated attackers to authenticate as any WordPress user, including administrators, by submitting a forged IPN request that overwrites a payment log entry's `user_id` with that of a target account, then visiting the success return URL with a legitimately obtained security hash to cause the plugin to issue real WordPress authentication cookies for the targeted account.