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CVE-2026-56036 – Unauthenticated SQL Injection – 워드프레스 결제 심플페이 (WordPress Payment SimplePay) <= 5…

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Summary

CVE-2026-56036 is a critical unauthenticated SQL injection vulnerability in 워드프레스 결제 심플페이 (WordPress Payment SimplePay), a WooCommerce payment gateway plugin developed by codemstory (WordPress.org slug: pgall-for-woocommerce). The flaw affects all plugin versions up to and including 5.5.6 and carries a CVSS v3.1 base score of 9.3 (Critical), enabling remote, unauthenticated attackers to inject arbitrary SQL statements and exfiltrate sensitive data directly from the underlying WordPress database.

Technical details

  • Root cause: Improper neutralization of special elements used in an SQL command (CWE-89), allowing malicious SQL to be injected into database queries processed by the plugin.
  • Trigger conditions: The vulnerability can be triggered remotely over the network with no authentication, no privileges, and no user interaction required; attack complexity is low.
  • Attack vector: Any unauthenticated remote attacker can send a crafted HTTP request to a WordPress site running the affected plugin version to exploit the flaw.
  • Impact: The CVSS vector (S:C / C:H) indicates a changed scope with high confidentiality impact — database content, including sensitive customer, order, and payment data stored in the WordPress database, can be extracted. A limited availability impact is also present. No integrity impact is indicated.

Affected software

  • 워드프레스 결제 심플페이 (WordPress Payment SimplePay) by codemstory (pgall-for-woocommerce), all versions <= 5.5.6

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

Mitigation and recommended actions

  • Immediate: Update the plugin to version 5.5.7 or later, which contains the security fix. The patched release is available through the WordPress Plugin Directory and the WordPress admin dashboard.
  • Administrators can verify their installed version under WordPress Admin → Plugins and compare against the fixed version.
  • As a general hardening measure, enforce the principle of least privilege on the WordPress database user account and monitor database logs for anomalous query activity on affected installations.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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