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Vulnerability record · CVE-2026-0656 · published 7 January 2026

CVE-2026-0656: Missing authorization vulnerability

The iPaymu Payment Gateway for WooCommerce plugin for WordPress is vulnerable to Missing Authentication in all versions up to, and including, 2.0.2 via the 'check_ipaymu_response' function. This is due to the plugin not validating webhook request authenticity through signature verification or origin checks. This makes it possible for unauthenticated attackers to mark WooCommerce orders as paid by sending crafted POST requests to the webhook endpoint without any payment occurring, as well as enumerate order IDs and obtain valid order keys via GET requests, exposing customer order PII including names, addresses, and purchased products.

8.2 CVSS 3.1 High EPSS 0.35% · top 74.2% CWE-862 · Missing authorization Deferred
8.2CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

Description

The iPaymu Payment Gateway for WooCommerce plugin for WordPress is vulnerable to Missing Authentication in all versions up to, and including, 2.0.2 via the 'check_ipaymu_response' function. This is due to the plugin not validating webhook request authenticity through signature verification or origin checks. This makes it possible for unauthenticated attackers to mark WooCommerce orders as paid by sending crafted POST requests to the webhook endpoint without any payment occurring, as well as enumerate order IDs and obtain valid order keys via GET requests, exposing customer order PII including names, addresses, and purchased products.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/ipaymu-for-woocommerce/tags/2.0.2/gateway.php?marks=316-336,370-380#L316
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3429657%40ipaymu-for-woocommerce&new=34
https://www.wordfence.com/threat-intel/vulnerabilities/id/7e639aed-ec67-4212-9051-1f7465bbfde2?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-0656), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.