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.

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

EPSS: 0.004 (33.4th percentile) — read the EPSS interpretation.

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.

Affected products

Shoheitanaka Japanized For Woocommerce — versions 0

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

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.