CVE-2026-1639 identifies a time-based blind SQL Injection vulnerability in the Taskbuilder – WordPress Project Management & Task Management plugin, specifically affecting the 'order' and 'sort_by' parameters. These parameters are insufficiently sanitized, allowing authenticated users with subscriber-level access or higher to inject arbitrary SQL commands into existing queries. The vulnerability arises from improper neutralization of special elements in SQL commands (CWE-89), where user input is directly concatenated into SQL statements without adequate escaping or use of prepared statements. Exploitation does not require user interaction and can be performed remotely over the network. The attack vector is network-based with low attack complexity and privileges required, but it only impacts confidentiality by enabling data extraction; integrity and availability remain unaffected. No patches are currently available, and no known exploits have been reported in the wild. The vulnerability affects all versions up to and including 5.0.2 of the plugin. The CVSS v3.1 score is 6.5 (medium), reflecting the balance between ease of exploitation and limited impact scope. This vulnerability is significant because subscriber-level users are commonly present in WordPress sites, and the plugin is used for project and task management, which may contain sensitive business data.

For European organizations, this vulnerability poses a risk of unauthorized disclosure of sensitive project management data stored within WordPress databases. Attackers with minimal privileges can leverage this flaw to extract confidential information such as user data, project details, or internal communications. This can lead to data breaches, loss of competitive advantage, and potential compliance violations under GDPR due to unauthorized access to personal data. Although the vulnerability does not affect data integrity or availability, the exposure of sensitive information can damage organizational reputation and trust. Organizations relying on Taskbuilder for managing projects and tasks are particularly vulnerable, especially if subscriber roles are widely assigned or if the plugin is used in environments with sensitive or regulated data. The absence of known exploits in the wild reduces immediate risk but does not eliminate the threat, as attackers may develop exploits once details become public. The vulnerability's network accessibility and low privilege requirements increase the attack surface, making it a concern for European businesses using WordPress-based project management solutions.

1. Monitor the Taskbuilder plugin vendor’s announcements closely and apply security patches immediately once released. 2. Until a patch is available, restrict subscriber-level user privileges to the minimum necessary and review user roles to limit access to the vulnerable parameters. 3. Implement Web Application Firewall (WAF) rules specifically designed to detect and block SQL Injection attempts targeting the 'order' and 'sort_by' parameters. 4. Conduct regular security audits and penetration testing focusing on WordPress plugins, especially those handling user input for database queries. 5. Employ database activity monitoring to detect unusual query patterns indicative of SQL Injection exploitation. 6. Consider isolating WordPress instances running the Taskbuilder plugin in segmented network zones to limit potential lateral movement. 7. Educate site administrators about the risks of granting subscriber-level access and encourage strong authentication and monitoring practices. 8. Backup WordPress databases regularly and verify the integrity of backups to ensure rapid recovery in case of compromise.