CVE-2026-87770 in Price Drop Alert for Woo Commerce Plugin
Summary
by MITRE • 09/18/2026
The Price Drop Alert for Woo Commerce WordPress plugin through 1.1 does not sanitize and escape parameters before using them in a SQL query on an AJAX action available to unauthenticated users, allowing unauthenticated attackers to perform SQL injection attacks and extract sensitive data from the database.
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Analysis
by VulDB Data Team • 09/18/2026
The vulnerability identified within the Price Drop Alert for WooCommerce WordPress plugin version 1.1 represents a critical security flaw rooted in insufficient input validation and output encoding mechanisms. Specifically, the application fails to properly sanitize or escape user-supplied parameters before incorporating them into SQL queries executed via an AJAX endpoint. This architectural oversight creates a direct pathway for unauthenticated attackers to manipulate database instructions, leading to potential data exfiltration and compromise of site integrity. The absence of rigorous input filtering on client-side triggered actions is particularly dangerous because it bypasses the typical authentication barriers that usually protect sensitive administrative functions or private user data in WordPress environments.
From a technical perspective, this flaw constitutes an SQL Injection vulnerability as defined by CWE-89 Improper Neutralization of Special Elements used in an SQL Command. The attacker can inject malicious SQL code through the parameters passed to the vulnerable AJAX action. Because the endpoint is accessible without authentication, any individual on the internet can interact with it directly using standard HTTP requests or automated tools like sqlmap. By carefully crafting payloads that exploit blind or error-based injection techniques, an adversary can extract information from the WordPress database, including user credentials, plugin configurations, and potentially other sensitive data stored in tables associated with WooCommerce transactions or customer records.
The operational impact of this vulnerability is severe due to its unauthenticated nature. Unlike vulnerabilities requiring prior login access, this flaw allows for remote code execution at the database level without any prerequisite authentication step. Attackers can enumerate database schemas, dump user hashes which may be cracked offline to reveal plaintext passwords, and potentially escalate privileges if other related vulnerabilities exist in conjunction with this SQL injection vector. The exposure of sensitive customer data violates privacy regulations such as GDPR or CCPA depending on jurisdiction, while the compromise of administrative credentials could lead to full site takeover, defacement, or deployment of malware to visitors.
This vulnerability aligns closely with MITRE ATT&CK technique T1059 Command and Scripting Interpreter sub-techniques related to SQL commands, specifically under the broader category of Data from Information Repositories (T1213). The attacker leverages the application's own database interface as a tool for unauthorized data access. Furthermore, it reflects common weaknesses in web application development where developers assume that AJAX endpoints are inherently secure or only accessible by authenticated sessions without explicitly verifying permissions and sanitizing inputs on every request path.
Mitigation strategies must focus on immediate remediation of the codebase alongside broader security hardening practices. The primary fix involves implementing strict input validation and parameterized queries for all database interactions, ensuring that user-supplied data is never directly concatenated into SQL statements. Developers should utilize prepared statements with bound parameters provided by modern PHP databases extensions like PDO or MySQLi to separate logic from data effectively. Additionally, output encoding must be applied where dynamic content is rendered in the browser context to prevent secondary issues such as Cross-Site Scripting if any reflected input occurs elsewhere in the application flow.
Administrators should immediately update the plugin to a patched version that addresses these sanitization failures. If an updated version is not yet available, temporary mitigation involves disabling the specific AJAX action via server-side configuration or firewall rules until the patch can be applied. It is also advisable to review other plugins for similar patterns of unsanitized input in public-facing endpoints and implement Web Application Firewall (WAF) rules that detect common SQL injection signatures as a defense-in-depth measure. Regular security audits and static code analysis tools should be integrated into the development lifecycle to catch such oversights before deployment, ensuring compliance with secure coding standards like OWASP Top 10 guidelines for preventing injection flaws.