CVE-2026-19056 in ProSolution WP Client Plugin
Summary
by MITRE • 08/19/2026
The ProSolution WP Client WordPress plugin before 2.0.11 does not sanitise and escape a parameter before reflecting it into an HTML attribute on one of its administrative pages, leading to reflected Cross-Site Scripting that runs in the session of an administrator induced to submit a crafted request.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 08/19/2026
The vulnerability identified within the ProSolution WP Client WordPress plugin prior to version 2.0.11 represents a classic instance of Reflected Cross-Site Scripting, technically classified under CWE-79: Improper Neutralization of Input During Web Page Generation. This flaw stems from an insufficient sanitization and escaping mechanism applied to user-supplied input before it is reflected back into the HTML context of administrative pages. Specifically, the application fails to properly encode special characters within a parameter that is directly embedded into an HTML attribute without adequate validation or encoding procedures. This oversight allows malicious actors to inject executable JavaScript code into the page content served by the server.
From an operational perspective, this vulnerability poses a significant risk due to its execution context. Because the flaw resides on administrative pages and requires user interaction to trigger via a crafted request, it is categorized as Reflected Cross-Site Scripting rather than Stored or DOM-based variants. The impact is particularly severe because the victim must be an administrator with elevated privileges within the WordPress environment. An attacker can craft a malicious URL containing the injected script payload and deceive an administrator into visiting this link through social engineering tactics such as phishing emails, compromised websites, or direct messaging. Once the administrator loads the crafted page in their browser while logged into the administrative dashboard, the malicious JavaScript executes with the full privileges of that admin session.
The exploitation potential extends beyond simple alert boxes to include sophisticated attacks defined by MITRE ATT&CK techniques such as T1059: Command and Scripting Interpreter or T1213: Data from Information Repositories. An attacker leveraging this vulnerability could steal administrative cookies, session tokens, or authentication credentials stored in the browser memory. This theft would allow the adversary to hijack the administrator's session, effectively gaining unauthorized access to the WordPress backend without needing valid login credentials. Furthermore, the script can perform actions on behalf of the admin, such as creating new user accounts with elevated privileges, modifying site settings, installing malicious plugins, or exfiltrating sensitive database contents and configuration files that are accessible through the administrative interface.
Mitigation strategies for this vulnerability primarily involve upgrading to version 2.0.11 or later of the ProSolution WP Client plugin, where the developers have implemented proper input sanitization and output escaping mechanisms consistent with WordPress coding standards. For organizations unable to immediately patch, temporary mitigations include restricting access to administrative pages through IP whitelisting if feasible, implementing a Web Application Firewall that can detect and block common XSS payloads in URL parameters, and enforcing strict Content Security Policy headers to limit the execution of inline scripts where possible. Additionally, security awareness training for administrators is crucial to prevent social engineering attacks that rely on tricking users into clicking malicious links containing crafted URLs designed to exploit this specific reflection flaw.