Auth bypass in Shoheitanaka Japanized For Woocommerce
CVE-2026-1305
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (33.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Shoheitanaka Japanized For Woocommerce — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/8cef4b2b-ae8d-4e18-b763-6960a…
- plugins.trac.wordpress.org/browser/woocommerce-for-japan/trunk/includes/gateway…
- plugins.trac.wordpress.org/browser/woocommerce-for-japan/trunk/includes/gateway…
- plugins.trac.wordpress.org/browser/woocommerce-for-japan/tags/2.8.2/includes/ga…
- plugins.trac.wordpress.org/browser/woocommerce-for-japan/tags/2.8.2/includes/ga…
- plugins.trac.wordpress.org/changeset/3464868/woocommerce-for-japan/trunk/includ…
Frequently asked questions
- What is CVE-2026-1305?
- CVE-2026-1305 is a medium-severity vulnerability in Shoheitanaka Japanized For Woocommerce, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-02-27.
- How severe is CVE-2026-1305?
- Medium severity. CVSS v3 base score is 5.3 out of 10.