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CVE-2026-66473 – Authorization Bypass – Xendit Payment WordPress Plugin <= 7.1.0

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Summary

CVE-2026-66473 is a high-severity Broken Access Control vulnerability (CWE-862: Missing Authorization) affecting the Xendit Payment WooCommerce plugin (woo-xendit-virtual-accounts) for WordPress in all versions up to and including 7.1.0. The flaw allows unauthenticated remote attackers to invoke privileged plugin functionality without any credentials or user interaction, carrying a CVSS v3.1 base score of 7.5 (High). As of the publication date (July 27, 2026), no patched version has been released.

Technical details

  • Root cause: Missing authorization, authentication, and nonce token validation on a plugin function, enabling unprivileged callers to execute actions restricted to higher privilege levels (CWE-862: Missing Authorization).
  • Trigger conditions: The vulnerability can be triggered over the network with low attack complexity; no authentication, existing account, or user interaction is required.
  • Attack vector: Network (AV:N/AC:L/PR:N/UI:N) — the affected endpoint or function is reachable directly via HTTP/HTTPS requests to the WooCommerce storefront.
  • Impact: High integrity impact (I:H) with no confidentiality or availability component. In the context of a payment gateway plugin, a missing-authorization flaw of this type enables unauthorized manipulation of payment-related functionality — such as altering order or payment status — without completing a legitimate transaction. A closely related prior vulnerability (CVE-2025-14461, affecting versions ≤ 6.0.2) documented that the same class of missing-authorization flaw in this plugin allowed unauthenticated actors to mark orders as paid via an unprotected callback endpoint, resulting in financial loss and inventory depletion for merchants.

Affected software

  • Xendit Payment WordPress/WooCommerce plugin (woo-xendit-virtual-accounts), all versions <= 7.1.0

Severity

  • CVSS v3.1 Base Score: 7.5 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Mitigation and recommended actions

  • Immediate: No official patched version is available as of July 27, 2026. Version 7.1.0 is the current latest release. Monitor the WordPress.org plugin page (woo-xendit-virtual-accounts) and apply the vendor patch as soon as it is released.
  • Interim workarounds:
    • If the plugin is not actively required, consider temporarily deactivating it until a patched version is published.
    • Apply web application firewall (WAF) rules to block unauthorized requests to the plugin’s callback and payment-processing endpoints.
    • Review WooCommerce order logs for anomalous order status transitions (e.g., orders marked as paid without a corresponding Xendit payment record) as an indicator of exploitation attempts.
    • Restrict access to WordPress admin and WooCommerce endpoints at the network or hosting level where feasible.

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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