CVE-2026-19053: ProSolution WP Client SQLi Vulnerability

CVE-2026-19053 Overview

CVE-2026-19053 is a blind SQL injection vulnerability in the ProSolution WP Client WordPress plugin versions prior to 2.0.6. The plugin fails to sanitize and escape a user-supplied parameter before including it in a SQL statement. Unauthenticated visitors can reach the vulnerable code path over the network without any user interaction. Successful exploitation allows attackers to extract sensitive database contents and modify records, including user credentials and site configuration. The flaw is classified under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Unauthenticated attackers can execute arbitrary SQL queries against the WordPress database, exposing confidential data and enabling record tampering across affected sites.

Affected Products

ProSolution WP Client WordPress plugin versions before 2.0.6
WordPress sites with the vulnerable plugin installed and activated
Any hosting environment exposing the plugin endpoint to the public internet

Discovery Timeline

2026-08-10 - CVE-2026-19053 published to NVD
2026-08-10 - Last updated in NVD database

Technical Details for CVE-2026-19053

Vulnerability Analysis

The ProSolution WP Client plugin accepts a parameter from HTTP requests and concatenates it into a SQL query without applying sanitization or parameter binding. Because the endpoint is reachable by unauthenticated visitors, no session, nonce, or capability check gates the injection point. The response does not directly return query results, which makes this a blind SQL injection. Attackers infer data by observing response differences or timing delays produced by injected boolean or time-based payloads.

Blind SQL injection remains fully exploitable through automated tooling. An attacker can enumerate table names, extract wp_users records, and retrieve password hashes character by character. Once hashes are obtained, offline cracking or password reset abuse allows full site takeover.

Root Cause

The root cause is the plugin's use of unsanitized input in a dynamically constructed SQL statement. WordPress provides the $wpdb->prepare() API for safe parameterization, but the affected code path bypasses it. The absence of type casting and escape routines such as esc_sql() compounds the issue.

Attack Vector

Exploitation requires only network access to the WordPress site. The attacker sends a crafted HTTP request containing SQL metacharacters in the vulnerable parameter. No authentication, privileges, or user interaction are required. Automated scanners such as sqlmap can identify and exploit the flaw once the endpoint is fingerprinted. Refer to the WPScan Vulnerability Report for endpoint specifics.

Detection Methods for CVE-2026-19053

Indicators of Compromise

HTTP requests to plugin endpoints containing SQL keywords such as UNION, SELECT, SLEEP, BENCHMARK, or INFORMATION_SCHEMA
Unusually long response times on plugin URLs, consistent with time-based blind SQL injection payloads
Unexpected new administrator accounts or modified wp_users and wp_options rows
Web server access logs showing repeated requests from a single source with incremental parameter changes

Detection Strategies

Deploy a Web Application Firewall rule that flags SQL metacharacters and boolean-based injection signatures on requests targeting /wp-content/plugins/ paths
Enable MySQL general query logging temporarily to identify malformed queries originating from the plugin
Correlate WordPress audit logs with web server logs to detect enumeration patterns against unauthenticated endpoints

Monitoring Recommendations

Alert on spikes in 500-series HTTP responses from plugin endpoints, which often accompany injection probing
Monitor outbound database query latency for anomalies indicating time-based injection
Track file integrity on wp-config.php and plugin directories to detect follow-on tampering

How to Mitigate CVE-2026-19053

Immediate Actions Required

Update the ProSolution WP Client plugin to version 2.0.6 or later on every affected site
Audit wp_users, wp_usermeta, and wp_options tables for unauthorized modifications and rogue administrator accounts
Rotate all WordPress administrator passwords and invalidate active sessions after patching
Review web server and database logs for injection attempts predating the patch

Patch Information

The vendor released version 2.0.6 of the ProSolution WP Client plugin, which sanitizes and escapes the affected parameter before use in SQL statements. Site administrators should apply the update through the WordPress plugin dashboard or by replacing the plugin files manually. Verify the installed version equals or exceeds 2.0.6 after upgrading.

Workarounds

Deactivate and remove the ProSolution WP Client plugin until the patched version can be installed
Restrict access to the vulnerable plugin endpoint via .htaccess or NGINX rules limiting requests to trusted IP ranges
Deploy a WAF rule blocking requests to the plugin path containing SQL syntax tokens

bash

# NGINX example: block requests containing common SQLi tokens targeting the plugin
location ~* /wp-content/plugins/prosolution-wp-client/ {
    if ($args ~* "(union|select|sleep\(|benchmark\(|information_schema)") {
        return 403;
    }
}