CVE-2026-19049: ProSolution WP Client SQLi Vulnerability

CVE-2026-19049 Overview

CVE-2026-19049 is an unauthenticated SQL injection vulnerability [CWE-89] in the ProSolution WP Client WordPress plugin versions prior to 2.0.9. The plugin reads a cookie value and passes it directly into SQL queries without sanitization. The vulnerable code path executes on every request and lacks authentication or capability checks. Unauthenticated attackers can read arbitrary data from the WordPress database and delete records the plugin stores.

Critical Impact
Unauthenticated attackers can extract sensitive database contents and destroy plugin-managed records by manipulating a single cookie value.

Affected Products

ProSolution WP Client WordPress plugin versions before 2.0.9
WordPress sites with the plugin installed and activated
Any environment relying on the plugin for client data storage

Discovery Timeline

2026-08-10 - CVE-2026-19049 published to NVD
2026-08-11 - Last updated in NVD database

Technical Details for CVE-2026-19049

Vulnerability Analysis

The vulnerability is a classic SQL injection [CWE-89] triggered through an unauthenticated request path. The ProSolution WP Client plugin reads a cookie value on every incoming request and concatenates that value into SQL statements without escaping or parameterization. Because the handler runs before any authentication or capability check, any anonymous visitor can supply a crafted cookie.

Exploitation allows attackers to alter query logic. Attackers can enumerate table names, exfiltrate user records, dump WordPress secrets, and issue DELETE statements against records the plugin manages. The scope is marked as changed because the injection can reach data outside the plugin's immediate context within the shared WordPress database.

The attack requires no user interaction and can be automated at scale against WordPress sites running the affected plugin. See the WPScan Vulnerability Report for further technical details.

Root Cause

The root cause is missing input sanitization on a cookie value that reaches an SQL query. The plugin trusts client-supplied cookie data and does not use prepared statements or WordPress $wpdb->prepare() helpers. Compounding the defect, the handler runs on every request without an is_user_logged_in() or capability gate.

Attack Vector

An attacker sends an HTTP request to the target WordPress site with a crafted cookie header. The cookie value contains SQL syntax that breaks out of the intended query context. The plugin processes the request, executes the tampered query, and returns data or performs deletions. No credentials, tokens, or user interaction are required.

The vulnerability enables blind, boolean-based, time-based, and UNION-based SQL injection techniques depending on query construction. Attackers can also chain the flaw with DELETE-style payloads to remove plugin records and disrupt site operations.

Detection Methods for CVE-2026-19049

Indicators of Compromise

Anomalous HTTP requests containing SQL keywords (UNION, SELECT, SLEEP, --) within Cookie headers
Unexpected DELETE operations against ProSolution WP Client plugin tables in database audit logs
Elevated database query error rates originating from the plugin's request handler
Unauthenticated requests with unusually long or encoded cookie values targeting site endpoints

Detection Strategies

Deploy web application firewall rules that inspect cookie values for SQL injection patterns
Enable WordPress database query logging and alert on syntax errors tied to plugin queries
Monitor for repeated requests from a single source with varying cookie payloads consistent with SQLi tooling such as sqlmap
Review installed plugin versions across the estate and flag any ProSolution WP Client instance below 2.0.9

Monitoring Recommendations

Ingest WordPress access logs and MySQL general or slow query logs into a centralized SIEM for correlation
Alert on unauthenticated requests that trigger plugin code paths executing SQL statements
Track baseline query volume against plugin tables and alert on sudden DELETE spikes

How to Mitigate CVE-2026-19049

Immediate Actions Required

Update the ProSolution WP Client WordPress plugin to version 2.0.9 or later immediately
If patching is not feasible, deactivate and remove the plugin until the update can be applied
Rotate WordPress secrets, database credentials, and user session tokens if compromise is suspected
Review database contents and backups for evidence of unauthorized reads or deletions

Patch Information

The vendor addressed the vulnerability in ProSolution WP Client version 2.0.9. The fix sanitizes the cookie value before use in SQL queries. Administrators should apply the update through the WordPress plugin manager. Refer to the WPScan Vulnerability Report for advisory details.

Workarounds

Block or strip the plugin's cookie at the reverse proxy or CDN layer until the update is applied
Deploy WAF signatures that reject cookie values containing SQL metacharacters such as single quotes, semicolons, and comment markers
Restrict administrative endpoints to trusted IP ranges to reduce exposure while updates are staged

bash

# Example WP-CLI command to update the plugin to the patched version
wp plugin update prosolution-wp-client --version=2.0.9