The Japanized for WooCommerce plugin for WordPress is vulnerable to Improper Authentication in versions up to, and including, 2.8.4. This is due to a flawed permission check in the `paidy_webhook_permission_check` function that unconditionally returns `true` when the webhook signature header is omitted. This makes it possible for unauthenticated attackers to bypass payment verification and fraudulently mark orders as "Processing" or "Completed" without actual payment via a crafted POST request to the Paidy webhook endpoint.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
References 6
https://plugins.trac.wordpress.org/browser/woocommerce-for-japan/tags/2.8.2/inc…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/woocommerce-for-japan/tags/2.8.2/inc…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/woocommerce-for-japan/trunk/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/woocommerce-for-japan/trunk/includes…
security@wordfence.com
https://plugins.trac.wordpress.org/changeset/3464868/woocommerce-for-japan/trun…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/8cef4b2b-ae8d-4e18-b7…
security@wordfence.com