External risk intelligence

ProSolution WP Client Blind SQL Injection Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.1)

CVE-2026-19053

The vulnerability exists in a WordPress plugin that is reachable by unauthenticated visitors. WordPress sites and their plugins are typically public-facing web services by design, making this attack surface inherently internet-exposed.

SQL Injection

Halo Surface Signal: 5 out of 5 — more likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the ProSolution WP Client WordPress plugin, which allows unauthenticated visitors to potentially manipulate database queries. This could lead to unauthorized access to or modification of sensitive information stored within the WordPress site. The main concern is confirming if this plugin is in use and if so, what the exposure might be.

Sensitive data exposure via database manipulation.
Protects customer and business information.
Confirm usage and assess exposure.

Attack Path

How an attacker could exploit the issue

An attacker can target unauthenticated visitors of a WordPress site running the ProSolution WP Client plugin. By sending a specially crafted request to the vulnerable component, an attacker can inject malicious SQL code. This could allow them to extract sensitive information from the site's database.

Accessible by unauthenticated visitors.
Injects SQL code via a parameter.
Enables database information theft.

Live Threat

Current exploitation, exposure, and threat context

Unauthenticated visitors could potentially trigger a blind SQL injection, which might expose sensitive information from the website's database. This could occur when the vulnerable parameter is accessed without proper sanitization or escaping.

Website database content at risk.
SQL injection via unauthenticated requests.
Potential for sensitive data exposure.

Operational Fix

Recommended remediation, mitigation, and detection steps

System owners and platform teams are likely responsible for addressing this SQL injection vulnerability in the ProSolution WP Client WordPress plugin. The first practical step is to identify all instances of the affected plugin across your WordPress deployments, confirm their exposure to unauthenticated visitors, and assess their business criticality to prioritize remediation efforts.

Application owners should own the issue.
Verify plugin exposure and business criticality.
Plan remediation based on confirmed risk.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the ProSolution WP Client plugin?

ProSolution WP Client is an add-on component for WordPress websites designed to help businesses manage client-specific information or project workflows. It integrates directly with the WordPress database to store and retrieve data, essentially acting as a bridge between the site's content management system and your proprietary client management records.

How does CVE-2026-19053 create a SQL injection risk?

This vulnerability stems from a weakness known as CWE-89, or Improper Neutralization of Special Elements used in an SQL Command. Because the plugin fails to sanitize user input, an attacker can input malicious SQL code into a specific parameter. The application then inadvertently executes this code against the database, potentially allowing unauthorized access to or manipulation of stored data.

Do I need to be logged in to trigger this vulnerability?

No, you do not need to be authenticated. The flaw is reachable by unauthenticated visitors, meaning anyone with internet access to the site can send the malicious request. Note that simply browsing the site or viewing static pages does not trigger the bug; the attacker must intentionally send a crafted request specifically targeting the vulnerable parameter.

Is my site at risk according to Halo Surface Signal?

Yes, if you run this plugin, you are likely at risk. Halo Surface Signal identifies this as an external attack surface because WordPress plugins are inherently designed to be reachable by unauthenticated visitors over the internet. Since this plugin interacts with a public-facing web service, it does not require an attacker to have internal network access to exploit the database.

What should I do first to address CVE-2026-19053?

Start by auditing your WordPress environment to identify every site currently running the ProSolution WP Client plugin. Once you have a list of deployments, verify which ones are exposed to the public internet and assess the sensitivity of the data stored in those specific databases. Use this inventory to prioritize updates or temporary mitigation for your most critical installations.

References

wpscan.com/vulnerability/c9bad349-d2d6-4b67-a107-818f25d9bf76/

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.