CVE-2025-23931: WordPress Local SEO SQL Injection Flaw

CVE-2025-23931 Overview

CVE-2025-23931 is a critical Blind SQL Injection vulnerability affecting the WordPress Local SEO plugin (also known as dh-local-seo). This vulnerability allows unauthenticated attackers to execute arbitrary SQL queries against the WordPress database by exploiting improper neutralization of special elements in SQL commands. The blind nature of the injection means that while direct data exfiltration may not be visible in responses, attackers can infer database contents through timing-based or boolean-based techniques.

Critical Impact

Unauthenticated attackers can extract sensitive database information including user credentials, site configuration, and potentially gain administrative access to WordPress installations running the vulnerable plugin.

Affected Products

• WordPress Local SEO plugin versions up to and including 2.3
• WordPress installations with the dh-local-seo plugin enabled
• All WordPress versions compatible with the affected plugin versions

Discovery Timeline

• January 22, 2025 - CVE-2025-23931 published to NVD
• January 22, 2025 - Last updated in NVD database

Technical Details for CVE-2025-23931

Vulnerability Analysis

This vulnerability falls under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The WordPress Local SEO plugin fails to properly sanitize user-supplied input before incorporating it into SQL queries executed against the WordPress database.

The vulnerability is exploitable over the network without requiring any authentication or user interaction. This makes it particularly dangerous as attackers can target any WordPress site running the vulnerable plugin version without needing any prior access or credentials.

The blind SQL injection variant means that the application does not return SQL error messages or query results directly in the response. Instead, attackers must infer information by observing application behavior changes, such as response time differences (time-based blind SQLi) or conditional response variations (boolean-based blind SQLi).

Root Cause

The root cause of CVE-2025-23931 is insufficient input validation and the lack of parameterized queries or prepared statements in the WordPress Local SEO plugin. User-controllable input is directly concatenated into SQL query strings without proper escaping or sanitization, allowing malicious SQL fragments to be injected and executed by the database engine.

WordPress provides built-in functions like $wpdb->prepare() for safely constructing SQL queries, but the vulnerable code paths in this plugin do not utilize these protective mechanisms consistently.

Attack Vector

The attack vector is network-based, requiring no authentication or privileges. An attacker can craft malicious HTTP requests containing SQL injection payloads that target vulnerable endpoints exposed by the WordPress Local SEO plugin. The exploitation process typically involves:

1. Identifying WordPress installations running the vulnerable plugin version
2. Crafting SQL injection payloads designed for blind extraction
3. Sending malicious requests to vulnerable plugin endpoints
4. Inferring database contents through timing analysis or response behavior
5. Extracting sensitive data such as administrator credentials or configuration values

Due to the blind nature of the vulnerability, exploitation may require numerous requests to fully extract data, but automated tools can significantly accelerate this process. For detailed technical analysis, refer to the Patchstack vulnerability database entry.

Detection Methods for CVE-2025-23931

Indicators of Compromise

• Unusual database query patterns or increased query execution times in WordPress database logs
• HTTP requests containing SQL syntax characters (', ", ;, --, UNION, SELECT, SLEEP()) targeting Local SEO plugin endpoints
• Multiple sequential requests with incrementally modified parameters (indicative of blind SQLi data extraction)
• Unexpected database access from web application user accounts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in request parameters
• Enable and monitor WordPress database query logging for anomalous query structures
• Implement intrusion detection signatures for time-based SQL injection payloads (e.g., SLEEP(), BENCHMARK() functions)
• Conduct regular vulnerability scanning of WordPress installations to identify outdated or vulnerable plugins

Monitoring Recommendations

• Monitor web server access logs for requests containing URL-encoded SQL metacharacters targeting the Local SEO plugin
• Set up alerts for database query execution times exceeding normal thresholds, which may indicate time-based blind SQLi attempts
• Track authentication events and privilege changes in WordPress that could indicate post-exploitation activity
• Implement file integrity monitoring on WordPress core files and plugin directories

How to Mitigate CVE-2025-23931

Immediate Actions Required

• Update the WordPress Local SEO plugin to the latest patched version as soon as available from the plugin developer
• If no patch is available, immediately disable and remove the WordPress Local SEO plugin from production environments
• Review WordPress database logs for signs of exploitation and audit user accounts for unauthorized changes
• Implement WAF rules to block SQL injection attempts targeting WordPress plugin endpoints

Patch Information

Organizations should monitor the WordPress plugin repository and the Patchstack security advisory for updates regarding patched versions of the WordPress Local SEO plugin. Until a patch is released, the recommended mitigation is to disable the vulnerable plugin.

Workarounds

• Disable and deactivate the WordPress Local SEO plugin (dh-local-seo) until a patched version is available
• Implement Web Application Firewall rules to filter SQL injection patterns in all incoming requests
• Restrict access to WordPress administrative and plugin endpoints using IP allowlisting where feasible
• Consider using WordPress security plugins that provide virtual patching capabilities for known vulnerabilities

# Disable WordPress Local SEO plugin via WP-CLI
wp plugin deactivate dh-local-seo

# Verify the plugin is deactivated
wp plugin status dh-local-seo

# Optionally remove the plugin entirely until patched
wp plugin delete dh-local-seo