CVE-2026-6674: WordPress CMS Plugin SQL Injection Flaw

CVE-2026-6674 Overview

The "CMS für Motorrad Werkstätten" plugin for WordPress contains a SQL Injection vulnerability in the arttype parameter affecting all versions up to and including 1.0.0. The vulnerability stems from insufficient escaping of user-supplied input and lack of proper preparation on existing SQL queries. Authenticated attackers with subscriber-level access or higher can exploit this flaw to append malicious SQL queries, enabling extraction of sensitive information from the WordPress database.

Critical Impact

Authenticated attackers with minimal privileges (subscriber-level) can extract sensitive database information including user credentials, configuration data, and other confidential records stored in the WordPress database.

Affected Products

• CMS für Motorrad Werkstätten plugin for WordPress version 1.0.0 and earlier
• WordPress installations using the vulnerable plugin versions

Discovery Timeline

• 2026-04-21 - CVE-2026-6674 published to NVD
• 2026-04-22 - Last updated in NVD database

Technical Details for CVE-2026-6674

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) exists within the cfmw-positions.php file of the CMS für Motorrad Werkstätten plugin. The vulnerable code fails to properly sanitize user input passed through the arttype parameter before incorporating it into database queries. This allows authenticated users with even minimal privileges to manipulate SQL query logic and access unauthorized data.

The attack can be executed remotely over the network and requires low complexity to exploit. While the vulnerability requires authentication, even basic subscriber-level accounts—which can often be created through open WordPress registration—provide sufficient access. The primary impact is confidentiality breach, as attackers can extract sensitive database contents without affecting data integrity or system availability.

Root Cause

The root cause is improper input validation and insufficient use of parameterized queries or prepared statements. The plugin directly incorporates user-supplied values from the arttype parameter into SQL queries without adequate escaping or sanitization. WordPress provides the $wpdb->prepare() method specifically to prevent SQL injection attacks, but this security control was not properly implemented in the affected code paths located around lines 202 and 207 of cfmw-positions.php.

Attack Vector

The attack is network-based and requires the attacker to have an authenticated session on the WordPress site with at least subscriber privileges. The attacker crafts a malicious request containing SQL injection payloads within the arttype parameter. When the plugin processes this parameter without proper sanitization, the injected SQL commands execute within the context of the database query, allowing the attacker to:

1. Extract user credentials and password hashes
2. Access sensitive configuration data
3. Enumerate database tables and their contents
4. Potentially access data from other applications sharing the same database

The vulnerability can be exploited by manipulating the arttype parameter to include SQL syntax that modifies the query logic. For example, appending UNION-based or time-based blind injection payloads allows attackers to systematically extract database contents. Detailed technical information about the vulnerable code can be found in the WordPress Plugin Code Repository.

Detection Methods for CVE-2026-6674

Indicators of Compromise

• Unusual or malformed requests to WordPress endpoints containing SQL syntax characters such as single quotes, UNION statements, or comment sequences in the arttype parameter
• Database query logs showing unexpected queries or queries with injected SQL commands
• Multiple failed or anomalous authentication attempts followed by database access from low-privilege accounts
• Web server logs containing URL-encoded SQL injection payloads targeting plugin-specific parameters

Detection Strategies

• Deploy web application firewall (WAF) rules to detect SQL injection patterns in HTTP request parameters, particularly targeting the arttype parameter
• Enable and monitor WordPress debug and error logs for SQL syntax errors that may indicate injection attempts
• Implement database activity monitoring to detect unusual query patterns or unauthorized data access
• Use intrusion detection systems (IDS) with signatures for common SQL injection attack patterns

Monitoring Recommendations

• Review web server access logs for requests containing SQL injection indicators such as UNION, SELECT, --, or ' in query parameters
• Monitor database query execution times for anomalies that may indicate time-based blind SQL injection attacks
• Track authentication events and correlate with subsequent database access patterns for signs of privilege abuse
• Set up alerts for multiple requests with SQL-like syntax from the same authenticated user session

How to Mitigate CVE-2026-6674

Immediate Actions Required

• Deactivate and remove the CMS für Motorrad Werkstätten plugin until a patched version is available
• Audit user accounts and remove or restrict unnecessary subscriber-level accounts
• Review database logs for signs of exploitation and check for unauthorized data access
• Implement WAF rules to block requests containing SQL injection payloads in the arttype parameter

Patch Information

At the time of publication, no official patch has been confirmed. Website administrators should monitor the Wordfence Vulnerability Report for updates on remediation guidance and check the WordPress plugin repository for updated versions that address this vulnerability.

Workarounds

• Disable the CMS für Motorrad Werkstätten plugin entirely until a security patch is released
• Restrict user registration to prevent attackers from obtaining subscriber accounts needed to exploit the vulnerability
• Implement additional input validation at the web server or WAF level to filter SQL injection payloads from requests
• Consider database-level access controls to limit the privileges of the WordPress database user

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate cms-fuer-motorrad-werkstaetten

# List all subscriber accounts for review
wp user list --role=subscriber --fields=ID,user_login,user_email

# Check for recent database access anomalies in MySQL slow query log
grep -i "UNION\|SELECT.*FROM.*wp_users" /var/log/mysql/mysql-slow.log