CVE-2025-0853: PGS Core WordPress Plugin SQLi Vulnerability

CVE-2025-0853 Overview

The PGS Core plugin for WordPress contains a SQL Injection vulnerability in the save_header_builder function that allows unauthenticated attackers to extract sensitive information from the database. The vulnerability exists due to insufficient escaping on the user-supplied event parameter and lack of sufficient preparation on the existing SQL query.

This SQL Injection flaw enables attackers to append additional SQL queries into already existing queries, potentially exposing sensitive database contents including user credentials, personal information, and other confidential data stored within the WordPress database.

Critical Impact

Unauthenticated attackers can extract sensitive information from the WordPress database by exploiting the SQL Injection vulnerability in the event parameter of the save_header_builder function.

Affected Products

• PGS Core plugin for WordPress versions up to and including 5.8.0

Discovery Timeline

• 2025-05-06 - CVE-2025-0853 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-0853

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) affects the PGS Core WordPress plugin through its save_header_builder function. The vulnerability is accessible over the network without authentication, making it particularly dangerous for WordPress sites using this plugin.

The flaw stems from improper handling of user-supplied input in the event parameter. When processing this parameter, the plugin fails to adequately escape or sanitize the input before incorporating it into SQL queries. Additionally, the existing SQL query lacks proper prepared statement implementation, which would otherwise prevent injection attacks.

Successful exploitation allows attackers to read confidential data from the database, though the vulnerability does not appear to enable data modification or deletion based on the confidentiality-focused impact assessment.

Root Cause

The root cause of this vulnerability is twofold:

1. Insufficient Input Escaping: The event parameter in the save_header_builder function does not properly escape user-supplied input before use in SQL queries
2. Lack of Prepared Statements: The existing SQL query does not utilize parameterized queries or prepared statements, which are essential defenses against SQL Injection attacks

This combination allows attackers to inject malicious SQL syntax that gets executed as part of the database query, enabling unauthorized data extraction.

Attack Vector

The attack vector is network-based and requires no authentication, meaning any remote attacker can attempt exploitation without needing valid credentials. The attack leverages the event parameter within AJAX or form submissions to the save_header_builder function.

An attacker would craft a malicious request containing SQL injection payloads in the event parameter. When processed by the vulnerable function, the injected SQL code executes within the context of the existing query, allowing the attacker to enumerate database tables, extract user credentials, or retrieve other sensitive information.

For technical details on the exploitation mechanics, refer to the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-0853

Indicators of Compromise

• Unusual database query patterns or errors in WordPress logs referencing the save_header_builder function
• HTTP requests containing SQL syntax characters (single quotes, UNION, SELECT, etc.) in the event parameter
• Unexpected data extraction queries or database enumeration attempts in database logs
• Anomalous traffic patterns to WordPress AJAX endpoints associated with the PGS Core plugin

Detection Strategies

• Monitor web application firewall (WAF) logs for SQL injection patterns targeting WordPress plugin endpoints
• Implement database query logging to detect unusual SELECT statements or UNION-based injection attempts
• Deploy intrusion detection rules to identify SQLi payloads in POST parameters, specifically the event parameter
• Review WordPress audit logs for suspicious activity related to header builder functionality

Monitoring Recommendations

• Enable detailed logging for database queries executed by WordPress plugins
• Configure alerting for HTTP 500 errors or database syntax errors that may indicate SQLi probing
• Monitor for time-based blind SQL injection indicators such as abnormally long request response times
• Implement network traffic analysis to detect data exfiltration patterns

How to Mitigate CVE-2025-0853

Immediate Actions Required

• Update the PGS Core plugin to a patched version immediately (versions above 5.8.0)
• If updating is not immediately possible, consider temporarily disabling the PGS Core plugin
• Review database logs for any evidence of prior exploitation
• Implement web application firewall rules to block SQL injection attempts targeting the vulnerable endpoint

Patch Information

The vendor has addressed this vulnerability in versions released after 5.8.0. Administrators should update to the latest available version of the PGS Core plugin. For detailed changelog information, refer to the Potenza Global Changelog.

Workarounds

• Deploy a web application firewall (WAF) with SQL injection protection rules enabled
• Implement input validation at the server level to sanitize the event parameter before processing
• Restrict access to WordPress admin AJAX endpoints using IP whitelisting where feasible
• Consider using database user accounts with minimal privileges for WordPress database connections

# Example: Add ModSecurity rule to block SQLi attempts on the event parameter
SecRule ARGS:event "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in event parameter',\
    tag:'application-multi',\
    tag:'language-multi',\
    tag:'platform-multi',\
    tag:'attack-sqli'"