CVE-2026-19052 in ProSolution WP Client Plugin
Summary
by MITRE • 08/12/2026
The ProSolution WP Client WordPress plugin before 2.0.9 does not perform capability checks on two administrative AJAX actions, and the nonce they rely on is published on its public frontend, allowing any authenticated user, such as a subscriber, to trigger an administrative data synchronisation and to clear the ProSolution WP Client WordPress plugin before 2.0.9's activity records.
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Analysis
by VulDB Data Team • 08/12/2026
The vulnerability in ProSolution WP Client WordPress plugin versions prior to 2.0.9 represents a critical authorization flaw that undermines the security model of the affected system. This issue stems from insufficient capability validation within two administrative ajax endpoints, creating an access control bypass that allows any authenticated user to execute privileged operations. The flaw specifically affects the plugin's data synchronization and activity record clearing functions, which are intended to be restricted to administrators only. The vulnerability is exacerbated by the fact that the nonce values required for these operations are exposed in the plugin's public frontend interface, eliminating any client-side protection mechanisms that might otherwise prevent unauthorized usage.
The technical implementation of this vulnerability involves the absence of proper user role verification within the ajax action handlers. When authenticated users access the frontend, they can potentially discover and utilize the published nonces to perform administrative tasks without possessing the necessary privileges. This represents a classic case of insufficient authorization checks where the plugin fails to verify whether the requesting user has appropriate capabilities before executing sensitive operations. The flaw operates at the application layer and directly impacts the principle of least privilege, allowing lower-privileged users to perform actions typically restricted to administrators or higher-level roles.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables malicious actors with subscriber-level access to disrupt plugin functionality and potentially compromise system integrity. An attacker could repeatedly trigger data synchronization operations which might result in performance degradation or data inconsistency issues within the plugin's database records. The ability to clear activity records provides an additional attack vector for denial-of-service scenarios where an attacker could systematically remove audit trails, making it difficult to track malicious activities or troubleshoot system issues. This vulnerability undermines the security posture of WordPress installations and creates opportunities for persistent attacks that could go unnoticed due to the erased activity logs.
From a cybersecurity perspective, this vulnerability aligns with multiple common weakness enumerations including CWE-285 for insufficient authorization and CWE-352 for cross-site request forgery. The flaw also maps to several ATT&CK techniques such as privilege escalation through access token manipulation and defense evasion via log clearing activities. Organizations should prioritize immediate patching of affected installations to remediate this vulnerability, as the published nonces make exploitation straightforward for any authenticated user. Additionally, administrators should review their user permissions and consider implementing additional security measures including rate limiting for ajax endpoints and monitoring for unusual administrative activity patterns that might indicate exploitation attempts.
Recommended mitigations include upgrading to ProSolution WP Client plugin version 2.0.9 or later where capability checks have been implemented. Security professionals should also implement proper access controls at the web server level, monitor for unauthorized administrative actions through log analysis, and consider implementing additional authentication layers such as two-factor authentication for privileged accounts. The vulnerability highlights the importance of secure coding practices including proper input validation, capability checking, and avoiding exposure of sensitive security tokens in public interfaces. Organizations should conduct regular security assessments to identify similar authorization flaws within their WordPress installations and other web applications to prevent similar vulnerabilities from being exploited in the future.