CVE-2024-55990: Mollie for Contact Form 7 SQLi Vulnerability

CVE-2024-55990 is a blind SQL injection vulnerability in Mollie for Contact Form 7 plugin that affects versions up to 5.0.0. Attackers can exploit this flaw to extract sensitive database information. This article covers technical details, affected versions, impact assessment, and mitigation strategies.

CVE-2024-55990 Overview

CVE-2024-55990 is a blind SQL injection vulnerability in the Mollie for Contact Form 7 (cf7-mollie) WordPress plugin by tsjippy. The flaw affects all versions up to and including 5.0.0. Authenticated attackers with high privileges can inject SQL commands through unsanitized input passed to database queries. The vulnerability maps to CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Attackers can extract sensitive database contents through blind SQL injection, exposing customer data, WordPress credentials, and payment metadata stored by the Mollie integration.

Affected Products

tsjippy Mollie for Contact Form 7 (cf7-mollie) plugin versions through 5.0.0
WordPress installations using the Mollie for Contact Form 7 integration
Sites processing Mollie payment transactions via Contact Form 7

Discovery Timeline

2024-12-16 - CVE-2024-55990 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-55990

Vulnerability Analysis

The vulnerability resides in the Mollie for Contact Form 7 plugin, which integrates the Mollie payment gateway with WordPress Contact Form 7. User-supplied input reaches SQL queries without proper neutralization of special characters. Attackers exploit this weakness through blind SQL injection, inferring database contents from application behavior rather than direct output.

Exploitation requires high privileges on the target WordPress instance according to the CVSS vector. The scope-changed rating indicates the injected query affects resources beyond the vulnerable component, exposing the broader WordPress database. Confidentiality impact is high because attackers retrieve arbitrary rows from tables such as wp_users, wp_usermeta, and plugin-specific payment records.

Root Cause

The root cause is failure to sanitize or parameterize input passed into SQL statements. The plugin likely concatenates request parameters directly into query strings instead of using WordPress's $wpdb->prepare() API with placeholders. Any request parameter reaching an affected query becomes an injection point.

Attack Vector

An authenticated attacker with administrator or comparable privileges submits crafted parameters to a vulnerable plugin endpoint. The payload contains boolean-based or time-based SQL predicates. The attacker observes conditional response differences or timing delays to reconstruct query results one bit at a time. Automated tools such as sqlmap streamline this extraction.

Refer to the Patchstack SQL Injection Advisory for advisory details. No public proof-of-concept code is available at this time.

Detection Methods for CVE-2024-55990

Indicators of Compromise

Unusual query patterns in MySQL slow query or general logs containing UNION SELECT, SLEEP(, BENCHMARK(, or nested SELECT statements originating from plugin endpoints.
Repeated HTTP requests to cf7-mollie administrative endpoints with encoded SQL metacharacters such as %27, %22, or 0x.
Anomalous response time variance on plugin URLs, indicative of time-based blind injection.
New or modified WordPress administrator accounts following suspicious plugin request activity.

Detection Strategies

Deploy a web application firewall with signatures for SQL injection payloads targeting WordPress plugin endpoints.
Enable MySQL query logging and alert on queries containing boolean tautologies (OR 1=1) or timing functions issued from the web application user.
Correlate authenticated admin session activity with database anomalies to identify insider or credential-theft-driven exploitation.

Monitoring Recommendations

Monitor WordPress access.log for POST and GET requests to /wp-admin/admin.php?page=cf7-mollie and related plugin paths.
Track outbound egress from the web server to detect data exfiltration following successful extraction.
Alert on privilege changes to WordPress accounts and modifications to the wp_options table.

How to Mitigate CVE-2024-55990

Immediate Actions Required

Disable or uninstall the Mollie for Contact Form 7 plugin until a patched release is confirmed.
Rotate WordPress administrator credentials and audit all privileged accounts for unauthorized additions.
Review MySQL user permissions to ensure the WordPress database user lacks FILE and administrative privileges.
Restrict /wp-admin access by IP allowlist where operationally feasible.

Patch Information

No fixed version is identified in the advisory. Sites should monitor the Patchstack advisory and the plugin's official repository for an update superseding version 5.0.0. Apply the patched version as soon as it is released.

Workarounds

Deploy a WAF rule set such as Patchstack, Wordfence, or ModSecurity Core Rule Set to block SQL injection payloads targeting cf7-mollie request parameters.
Enforce multi-factor authentication on all administrator accounts to raise the exploitation barrier.
Take a full database backup and verify integrity before applying any recovery actions.

bash

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate cf7-mollie
wp plugin delete cf7-mollie

# Rotate administrator passwords
wp user update admin --user_pass='<new-strong-password>'

# Review recent admin logins
wp db query "SELECT user_login, user_registered FROM wp_users WHERE user_registered > DATE_SUB(NOW(), INTERVAL 30 DAY);"