Japanized for WooCommerce <= 2.8.4 - Missing Authorization to Unauthenticated Paidy Order Manipulation

Improper Authentication
CVE CVE-2026-1305
CVSS Medium (5.3)
Publicly Published February 26, 2026
Last Updated February 27, 2026
Researcher Osvaldo Noe Gonzalez Del Rio (Os)
Description

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.

References

1 affected software package

Software Type Plugin
Software Slug woocommerce-for-japan (view on wordpress.org)
Patched? Yes
Affected Version
  • <= 2.8.4
Patched Version
  • 2.8.5
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