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CVE-2026-87770 – Unauthenticated SQL Injection – Price Drop Alert for WooCommerce ≤ 1.1

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Summary

CVE-2026-87770 is an unauthenticated SQL injection vulnerability in the Price Drop Alert for WooCommerce WordPress plugin (versions through 1.1). The plugin fails to sanitize and escape user-supplied parameters before using them in a SQL query executed via an AJAX action that is reachable by unauthenticated users, allowing remote attackers to extract sensitive data directly from the WordPress database. The issue carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: The plugin passes attacker-controlled parameters into a SQL query without proper sanitization or escaping (CWE-89: Improper Neutralization of Special Elements used in an SQL Command).
  • Trigger conditions: The vulnerable code path is exposed through a WordPress AJAX action (admin-ajax.php) that is registered for nopriv (unauthenticated) access, so no login or prior interaction is required.
  • Attack vector: Network-based; an attacker sends a crafted HTTP request containing malicious SQL payloads to the exposed AJAX endpoint. Exploitation can be performed with standard HTTP tooling or automated SQL injection scanners.
  • Impact: Successful exploitation allows extraction of sensitive data from the underlying database (e.g., WordPress/WooCommerce table contents such as user or order data), consistent with the vulnerability’s high confidentiality impact and unchanged integrity/availability impact.

Affected software

  • Price Drop Alert for WooCommerce (WordPress plugin, slug woo-price-drop-alert) — all versions up to and including 1.1.

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: As of this writing, no patched version of the plugin has been released. Security teams should check the plugin’s WordPress.org listing/changelog regularly for an update and apply it as soon as it becomes available.
  • If no patch is available:
    • Deactivate and remove the "Price Drop Alert for WooCommerce" plugin until a fix is released.
    • If deactivation is not immediately feasible, block or restrict access to the plugin’s AJAX action via a Web Application Firewall (WAF) rule targeting SQL injection patterns on wp-admin/admin-ajax.php requests tied to this plugin.
    • Monitor web server and database logs for anomalous requests to admin-ajax.php and for suspicious SQL error patterns.
    • Restrict direct internet exposure of the WordPress admin-ajax endpoint where operationally possible, and ensure database accounts used by WordPress follow least-privilege principles to limit the blast radius of a successful injection.

References

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