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CVE-2026-57677 – Unauthenticated PHP Object Injection – Novalnet Payment Gateway for WooCommerce …

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Summary

CVE-2026-57677 is a critical, unauthenticated PHP Object Injection vulnerability in the Novalnet Payment Gateway for WooCommerce WordPress plugin, affecting all versions up to and including 12.10.3. The flaw stems from unsafe deserialization of untrusted data, allowing any remote, unauthenticated attacker to inject arbitrary PHP objects over the network with no user interaction required. It carries a CVSS v3.1 base score of 9.8 (Critical), reflecting the potential for full system compromise.

Technical details

  • Root cause: The plugin deserializes attacker-controlled data without proper validation or integrity checks, enabling PHP Object Injection (CWE-502: Deserialization of Untrusted Data). The vulnerability is associated with the plugin’s webhook/callback request handling, as the patch for version 12.10.4 specifically addresses webhook request validation.
  • Trigger conditions: No authentication is required and no user interaction is needed. An attacker can send a specially crafted HTTP request directly to the affected endpoint on any publicly accessible WordPress site running the vulnerable plugin version.
  • Attack vector: Network-accessible; exploitable remotely over HTTP/HTTPS against any internet-exposed WooCommerce installation with the plugin active.
  • Impact: PHP Object Injection can be escalated to Remote Code Execution (RCE) if a suitable PHP gadget chain is present in the application environment. WordPress/WooCommerce deployments commonly include libraries that provide such gadget chains. Successful exploitation results in full confidentiality, integrity, and availability compromise of the affected server — including potential theft of payment-related configuration data, database credentials, and customer records.

Affected software

  • Novalnet Payment Gateway for WooCommerce — all versions ≤ 12.10.3

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate — update the plugin: Upgrade to version 12.10.4 or later, which resolves the vulnerability by improving webhook request validation. The update is available via the WordPress Plugin Repository.
  • If immediate patching is not possible: Consider temporarily deactivating the Novalnet Payment Gateway plugin until the update can be applied, and restrict external access to the WordPress site’s webhook/callback endpoint at the network or WAF level.
  • Verify your version: Confirm the installed plugin version in the WordPress admin panel under Plugins → Installed Plugins → Novalnet Payment Gateway for WooCommerce.

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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