CVE-2025-32126

Executive Summary

CVE-2025-32126 is a critical SQL Injection vulnerability discovered in the WordPress plugin Pay with Contact Form 7 by cmsMinds. This plugin is designed to integrate payment processing with Contact Form 7. The vulnerability allows an unauthenticated attacker to inject arbitrary SQL commands into the database through improper neutralization of special elements used in an SQL command. Successful exploitation could lead to complete compromise of the WordPress database, including extraction of user credentials, payment data, and other sensitive information. The vendor has not released a patch as of the latest analysis, leaving all sites running version 1.0.4 and below at high risk.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. The plugin is distributed through the official WordPress plugin repository and potentially via third-party marketplaces. Since no patch is available, users must consider this a supply chain risk. The plugin's codebase is not publicly versioned on GitHub or other platforms, making it difficult to track changes or verify fixes. Administrators should treat this as a zero-day threat and consider disabling the plugin until a patch is released.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – The attack can be launched remotely over the network.
• Attack Complexity (AC): Low (L) – No special conditions or complex steps are required.
• Privileges Required (PR): None (N) – No authentication is needed.
• User Interaction (UI): None (N) – The victim does not need to perform any action.
• Scope (S): Unchanged (U) – The vulnerability does not affect other components beyond the vulnerable plugin.
• Confidentiality (C): High (H) – Full database read access is possible.
• Integrity (I): High (H) – Data can be modified or deleted.
• Availability (A): High (H) – Database can be disrupted or destroyed.

CVSS Score: 7.6 (High) – This score reflects the severe impact and ease of exploitation.

Deep Dive & Mechanics

The vulnerability resides in the pay-with-contact-form-7 plugin's handling of user-supplied input within SQL queries. The plugin likely processes form submissions or payment gateway callbacks without properly sanitizing or parameterizing input that is used in SQL statements. An attacker can inject malicious SQL code via parameters such as form fields, transaction IDs, or other POST/GET variables.

Root Cause: The plugin uses string concatenation or interpolation to build SQL queries instead of prepared statements or parameterized queries. For example, a vulnerable code snippet might look like:

$query = "SELECT * FROM wp_payments WHERE transaction_id = '" . $_POST['transaction_id'] . "'";

An attacker can supply a value like ' OR '1'='1 to manipulate the query.

Attack Vector: The injection point is likely in a publicly accessible endpoint (e.g., a callback URL for payment gateways or a form submission handler). Since no authentication is required, any visitor can trigger the exploit.

Impact: Successful SQL injection can lead to:

• Extraction of the entire WordPress database (users, posts, options, payment logs).
• Insertion of malicious admin users.
• Modification of site content.
• Potential remote code execution if the database user has file write privileges.

Vulnerable vs. Patched Code

Since no patch is available, we can only describe the vulnerable pattern. A secure implementation would use prepared statements.

Vulnerable Code (Conceptual):

$transaction_id = $_POST['transaction_id'];
$sql = "SELECT * FROM wp_payments WHERE transaction_id = '$transaction_id'";
$result = $wpdb->get_results($sql);

Patched Code (Conceptual):

$transaction_id = $_POST['transaction_id'];
$sql = $wpdb->prepare("SELECT * FROM wp_payments WHERE transaction_id = %s", $transaction_id);
$result = $wpdb->get_results($sql);

The patched version uses $wpdb->prepare() to safely bind the parameter, preventing SQL injection.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install WordPress with the Pay with Contact Form 7 plugin version 1.0.4.
2. Set up a local web server (e.g., XAMPP, LAMP) with MySQL.
3. Ensure the plugin is active and configured with a test payment gateway.

Exploitation Steps:

1. Identify an injectable parameter. Common targets include transaction_id, form_id, or payment_status in POST requests.
2. Use a tool like sqlmap or manual injection to test:

   sqlmap -u "http://target/wp-admin/admin-ajax.php?action=pay_with_cf7_callback" --data="transaction_id=1" --batch --dbs
   

3. Manual injection example:

   POST /wp-admin/admin-ajax.php HTTP/1.1
   Host: target
   Content-Type: application/x-www-form-urlencoded
   
   action=pay_with_cf7_callback&transaction_id=1' UNION SELECT user_login,user_pass FROM wp_users--
   

4. Extract hashed passwords and crack them offline.

Note: No public exploit code is available, but the vulnerability is straightforward to exploit with standard SQL injection techniques.

Blue Team (Defensive)

Detection:

• Monitor web server logs for unusual SQL keywords in request parameters (e.g., UNION, SELECT, OR 1=1).
• Use a Web Application Firewall (WAF) with rules to block SQL injection patterns.
• Enable WordPress audit logging to track database queries.

Hunting:

• Search for requests to admin-ajax.php with suspicious action parameters related to the plugin.
• Look for error messages in logs that reveal SQL syntax errors.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests containing SQL keywords in POST/GET parameters targeting admin-ajax.php or plugin-specific endpoints.
  • Unusual database error messages in HTTP responses (e.g., "You have an error in your SQL syntax").
• File IOCs:
  • Modified WordPress core files or plugin files (check file integrity).
  • New admin users created in wp_users table.
• Log IOCs:
  • Repeated failed SQL queries in MySQL logs.
  • Unusual entries in WordPress debug.log.

Detection Engineering

YARA Rule

rule CVE_2025_32126_SQLi_WordPress {
    meta:
        description = "Detects SQL injection attempts against Pay with Contact Form 7 plugin"
        author = "Valters IT"
        date = "2025-04-01"
        cve = "CVE-2025-32126"
    strings:
        $s1 = "pay_with_cf7" nocase
        $s2 = "transaction_id" nocase
        $s3 = "UNION" nocase
        $s4 = "SELECT" nocase
        $s5 = "OR 1=1" nocase
    condition:
        all of ($s1, $s2) and any of ($s3, $s4, $s5)
}

Sigma Rule

title: SQL Injection Attempt Against Pay with Contact Form 7
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects SQL injection patterns in requests targeting the vulnerable plugin
author: Valters IT
date: 2025-04-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - 'pay_with_cf7'
            - 'transaction_id'
        cs-uri-query|contains|all:
            - 'UNION'
            - 'SELECT'
    condition: selection
falsepositives:
    - Legitimate use of UNION in rare cases (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-32126 SQL Injection Attempt"; flow:to_server,established; content:"pay_with_cf7"; http_uri; content:"transaction_id"; http_client_body; pcre:"/(UNION|SELECT|OR\s+1=1)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released. This is the only guaranteed mitigation.
2. If disabling is not possible, implement a Web Application Firewall (WAF) with strict SQL injection rules.
3. Restrict access to the plugin's callback endpoints using IP whitelisting or .htaccess authentication.

Long-term Fix:

• The vendor must release a patched version that uses prepared statements ($wpdb->prepare()) or parameterized queries.
• Monitor the WordPress plugin repository for updates.

Detection:

• Deploy the YARA, Sigma, and Suricata rules provided above.
• Enable detailed logging for all database queries and review regularly.

Valters IT
Securing Digital Frontiers