CVE-2026-1870 is a vulnerability classified under CWE-862 (Missing Authorization) found in the Thim Kit for Elementor – Pre-built Templates & Widgets for Elementor WordPress plugin, specifically in all versions up to and including 1.3.7. The flaw exists in the REST API endpoint 'thim-ekit/archive-course/get-courses', which lacks proper authorization validation. This endpoint is designed to retrieve LearnPress course content, including private or draft courses. Due to the missing authorization checks, an unauthenticated attacker can supply a crafted post_status parameter in the URL payload to access sensitive course data that should otherwise be restricted. The vulnerability allows disclosure of confidential information without requiring any authentication or user interaction, and it can be exploited remotely over the network. The CVSS v3.1 base score is 5.3, reflecting a medium severity level primarily due to the confidentiality impact and ease of exploitation. No integrity or availability impacts are noted. There are no known public exploits or patches available at the time of publication, which increases the urgency for organizations to apply mitigations. This vulnerability could be leveraged to gain insights into unpublished course materials, potentially exposing intellectual property or sensitive educational content.

The primary impact of CVE-2026-1870 is unauthorized disclosure of confidential or draft LearnPress course content, which can lead to intellectual property theft, loss of competitive advantage, or exposure of sensitive educational materials. Organizations relying on the Thim Kit for Elementor plugin for e-learning or course management may suffer reputational damage and loss of trust from users or customers if private course content is leaked. Although the vulnerability does not affect data integrity or system availability, the confidentiality breach could have legal and compliance ramifications, especially for institutions handling sensitive or proprietary information. Since exploitation requires no authentication and can be performed remotely, the attack surface is broad, increasing the risk of widespread unauthorized data access. The lack of known exploits in the wild currently limits immediate risk, but the vulnerability remains exploitable until remediated.

To mitigate CVE-2026-1870, organizations should first check for and apply any available updates or patches from the Thimpress vendor once released. In the absence of official patches, administrators should restrict access to the vulnerable REST API endpoint by implementing web application firewall (WAF) rules that block unauthenticated requests to 'thim-ekit/archive-course/get-courses'. Additionally, limiting REST API access to authenticated users or trusted IP addresses can reduce exposure. Review and harden WordPress user roles and permissions to ensure that only authorized users can access course content. Monitoring web server and application logs for unusual or unauthorized access attempts targeting this endpoint is recommended. If possible, temporarily disabling the plugin or the affected feature until a patch is available can prevent exploitation. Finally, organizations should educate their security teams about this vulnerability to ensure timely detection and response.