CVE-2025-10039 identifies a security vulnerability in the ELEX WordPress HelpDesk & Customer Ticketing System plugin, which is widely used to manage customer support tickets within WordPress environments. The vulnerability is classified as an Insecure Direct Object Reference (IDOR), specifically CWE-639, caused by insufficient validation of a user-controlled key parameter named 'eh_crm_ticket_single_view_client'. This parameter is used to retrieve individual support tickets. Due to missing authorization checks, any authenticated user with at least Subscriber-level privileges can manipulate this key to access the contents of all support tickets, bypassing intended access controls. The vulnerability affects all plugin versions up to and including 3.2.9. Exploitation requires no user interaction and can be performed remotely over the network with low attack complexity. The CVSS v3.1 base score is 4.3, reflecting a medium severity primarily due to the confidentiality impact, as the vulnerability does not affect integrity or availability. No public exploits or patches are currently available, increasing the risk window for affected deployments. This vulnerability could lead to unauthorized disclosure of sensitive customer support information, which may include personal data, technical details, or business-sensitive communications. The plugin's widespread use in WordPress installations, especially in customer service contexts, amplifies the potential exposure. The vulnerability was reserved in early September 2025 and published in November 2025, indicating recent discovery and disclosure.

For European organizations, this vulnerability poses a significant confidentiality risk by allowing unauthorized access to customer support tickets, which may contain personal data protected under GDPR and other privacy regulations. Exposure of such data could lead to regulatory penalties, reputational damage, and loss of customer trust. Organizations relying on the ELEX plugin for customer service management are at risk of internal data leakage, especially if they grant Subscriber-level access broadly or have weak user privilege management. Attackers exploiting this flaw could gather sensitive information about customers, support issues, or internal processes. While the vulnerability does not affect system integrity or availability, the breach of confidentiality alone can have serious compliance and operational consequences. European companies in sectors such as finance, healthcare, and e-commerce, which often handle sensitive customer data, are particularly vulnerable. Additionally, the lack of a patch means organizations must rely on interim controls, increasing operational overhead and risk. The medium CVSS score reflects moderate severity, but the real-world impact depends on the sensitivity of the ticket contents and the organization's user access policies.

Until an official patch is released, European organizations should implement several specific mitigations: 1) Restrict Subscriber-level and higher access strictly to trusted users and review user roles to minimize unnecessary privileges. 2) Implement web application firewall (WAF) rules to detect and block suspicious requests attempting to manipulate the 'eh_crm_ticket_single_view_client' parameter. 3) Apply custom code or hooks in WordPress to enforce strict validation and authorization checks on ticket access, ensuring users can only view their own tickets. 4) Monitor logs for unusual access patterns to support ticket endpoints, especially from authenticated users with low privileges. 5) Educate administrators and support staff about the vulnerability and the importance of access control hygiene. 6) Consider temporarily disabling or replacing the ELEX HelpDesk plugin if feasible, especially in high-risk environments. 7) Stay alert for official patches or updates from the vendor and apply them promptly once available. 8) Conduct an audit of existing ticket data exposure and prepare incident response plans in case of exploitation. These measures go beyond generic advice by focusing on access control tightening, monitoring, and temporary compensating controls specific to this plugin and vulnerability.