CVE-2017-20244: SQL Injection in Wow Forms WordPress Plugin v2.1 – Critical Unauth Database Extraction

Technical summary

CVE-2017-20244 is an unauthenticated SQL injection vulnerability in Wow Forms WordPress plugin v2.1. The vulnerability exists in the admin-ajax.php endpoint's 'send_mwp_form' action handler, which fails to properly sanitize the 'mwpformid' POST parameter before using it in a database query. This allows an attacker to inject arbitrary SQL syntax and extract database records. The vulnerability carries a CVSS v3.1 score of 8.2 (HIGH), reflecting high confidentiality impact, limited integrity impact, and no availability impact. The attack requires no authentication, no user interaction, and can be executed over the network with low complexity.

Business impact

This vulnerability poses a significant risk to any WordPress site running the vulnerable Wow Forms plugin. Attackers can extract user databases, payment information, personal data, and authentication tokens without detection, leading to identity theft, account takeover, and regulatory compliance violations (GDPR, CCPA, etc.). Organizations relying on this plugin for lead generation or customer forms face potential data breach notification costs, reputation damage, and legal liability. The lack of authentication requirement means attackers can exploit the flaw from anywhere on the internet.

Affected systems

Wow Forms WordPress plugin version 2.1 is explicitly vulnerable. The vulnerability affects all WordPress installations where this specific version is active and publicly accessible. Sites using other versions of Wow Forms or sites that have already removed the plugin are not affected. No vulnerability data for other versions has been disclosed.

Exploitability

This vulnerability is highly exploitable. It requires no authentication, no user interaction, and can be triggered via a simple HTTP POST request to a publicly accessible endpoint. An attacker needs only basic knowledge of SQL syntax and the plugin's action name to craft a working exploit. The network-accessible nature and low complexity of exploitation make this a critical priority for immediate remediation.

Remediation

Organizations using Wow Forms WordPress plugin v2.1 should immediately deactivate and remove the plugin until a patched version is available from the vendor. As an interim measure, restrict access to admin-ajax.php using web application firewall rules or .htaccess directives to block requests containing the 'send_mwp_form' action. After removal or patching, conduct a database audit and security log review to detect any unauthorized access, then reset user passwords and review user accounts for suspicious activity.

Patch guidance

Check the official Wow Forms plugin repository and vendor advisories for a patched release. Verify the fix includes proper parameterized queries or input validation for the 'mwpformid' parameter. Before applying patches in production, test in a staging environment to ensure compatibility with your WordPress version and other active plugins. Document the patch version number and deployment date for compliance records.

Detection guidance

Search WordPress logs and web server access logs for POST requests to admin-ajax.php containing the 'send_mwp_form' action, especially those with suspicious SQL characters (single quotes, dashes, 'UNION', 'SELECT', etc.) in the request parameters. Monitor database query logs for unexpected SELECT statements or table enumeration queries executed by the web server process. Implement intrusion detection signatures for SQL injection patterns targeting this endpoint. Review any recent user account creations or privilege escalations that coincide with suspicious log entries.

Why prioritize this

This vulnerability merits immediate attention due to its HIGH CVSS score (8.2), unauthenticated exploitation capability, and direct access to sensitive database content. The lack of user interaction required and network accessibility make it trivial to exploit at scale. Organizations should treat this as a critical security incident if the vulnerable plugin is active, regardless of their current security posture.

Risk score, explained

The CVSS v3.1 score of 8.2 reflects a combination of high-impact factors: unrestricted network access (AV:N), low attack complexity (AC:L), no authentication needed (PR:N), and no user interaction required (UI:N). The high confidentiality impact (C:H) reflects the ability to read arbitrary database content. The limited integrity impact (I:L) suggests the vulnerability may allow minor data modification in some query scenarios, while availability is not affected (A:N). This score appropriately elevates the urgency beyond a typical information disclosure flaw.

Frequently asked questions