CVE-2025-30622: PostMash SQL Injection Vulnerability

CVE-2025-30622 Overview

A critical SQL Injection vulnerability has been discovered in the PostMash WordPress plugin developed by torsteino. The vulnerability stems from improper neutralization of special elements used in SQL commands, allowing unauthenticated attackers to inject malicious SQL queries. This issue affects PostMash versions from n/a through 1.0.3.

Critical Impact

This SQL Injection vulnerability allows unauthenticated remote attackers to extract sensitive database information, potentially compromising the confidentiality of the WordPress site and its users. The vulnerability requires no user interaction and can be exploited over the network.

Affected Products

• PostMash WordPress plugin version 1.0.3 and earlier
• WordPress sites using the postmash-custom plugin

Discovery Timeline

• 2025-04-01 - CVE-2025-30622 published to NVD
• 2025-04-01 - Last updated in NVD database

Technical Details for CVE-2025-30622

Vulnerability Analysis

This vulnerability is classified as CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'). The PostMash plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries, enabling attackers to manipulate database operations.

The attack can be executed remotely over the network without requiring any authentication or user interaction. If exploited, the vulnerability primarily impacts data confidentiality by allowing unauthorized access to database contents, with additional potential for limited service disruption.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization within the PostMash plugin. User-controlled input is directly concatenated or interpolated into SQL queries without proper escaping or parameterization. WordPress provides built-in functions like $wpdb->prepare() for safely handling database queries, but these protections appear to be missing or improperly implemented in the affected code paths.

Attack Vector

The vulnerability is exploitable via network-based attacks targeting WordPress installations with the PostMash plugin active. Attackers can craft malicious HTTP requests containing SQL injection payloads that are processed by the vulnerable plugin. Since no authentication is required, any external attacker with network access to the WordPress site can attempt exploitation.

Successful exploitation could enable attackers to:

• Extract sensitive data from the WordPress database including user credentials, posts, and configuration
• Potentially modify or delete database records depending on database permissions
• Enumerate database structure and pivot to other attacks

For technical details on this vulnerability, refer to the Patchstack WordPress Vulnerability Database.

Detection Methods for CVE-2025-30622

Indicators of Compromise

• Unusual database queries in WordPress/MySQL logs containing SQL injection patterns such as UNION SELECT, OR 1=1, or encoded variants
• HTTP request logs showing suspicious parameters with SQL syntax characters (single quotes, double dashes, semicolons)
• Unexpected data access or extraction attempts in database audit logs
• Error messages in web server logs indicating SQL syntax errors from malformed injection attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP requests
• Enable WordPress debug logging and monitor for database-related errors that may indicate exploitation attempts
• Deploy intrusion detection systems (IDS) with SQL injection detection signatures
• Utilize SentinelOne's behavioral detection capabilities to identify anomalous database access patterns

Monitoring Recommendations

• Monitor WordPress plugin directory for the presence of PostMash plugin (/wp-content/plugins/postmash-custom/)
• Set up alerts for unusual database query volumes or patterns from the web application
• Implement database activity monitoring to detect unauthorized data access
• Review web server access logs for requests containing SQL injection payload signatures

How to Mitigate CVE-2025-30622

Immediate Actions Required

• Deactivate and remove the PostMash plugin (postmash-custom) from all WordPress installations immediately
• Audit WordPress database for signs of unauthorized access or data exfiltration
• Review WordPress user accounts for any suspicious new administrator accounts that may have been created
• Implement Web Application Firewall (WAF) rules to block SQL injection attempts as a temporary mitigation

Patch Information

At the time of publication, no official patch has been released for this vulnerability. The affected versions include PostMash 1.0.3 and earlier. Organizations should monitor the Patchstack WordPress Vulnerability Database for updates regarding available patches.

Given the critical severity and lack of available patches, the recommended action is to completely remove the PostMash plugin and seek alternative solutions for the required functionality.

Workarounds

• Remove the PostMash plugin entirely until a security patch is available
• Deploy a Web Application Firewall (WAF) with SQL injection protection rules
• Implement database-level access controls to limit the WordPress database user's permissions to minimum required privileges
• Use WordPress security plugins that provide SQL injection protection capabilities

# Remove PostMash plugin via WP-CLI
wp plugin deactivate postmash-custom --allow-root
wp plugin delete postmash-custom --allow-root

# Verify plugin removal
wp plugin list --status=active --allow-root | grep postmash