CVE-2025-66054 is a missing authorization vulnerability identified in the ThimPress LearnPress WordPress plugin, specifically affecting versions up to 4.2.9.4. This vulnerability arises from incorrectly configured access control mechanisms within the plugin, allowing unauthenticated remote attackers to perform unauthorized actions that modify data integrity without requiring user interaction. The vulnerability does not impact confidentiality or availability but allows attackers to alter or manipulate data within the LearnPress environment, potentially compromising course content, user progress, or administrative settings. The CVSS 3.1 base score of 7.5 reflects a high severity due to the network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N). The scope remains unchanged (S:U), and the impact is limited to integrity (I:H) with no confidentiality (C:N) or availability (A:N) impact. Although no public exploits have been reported yet, the vulnerability's nature makes it a prime candidate for exploitation once weaponized. LearnPress is widely used in WordPress-based e-learning platforms, making this vulnerability relevant for educational institutions, training providers, and enterprises leveraging this plugin for online learning management. The lack of available patches at the time of disclosure necessitates immediate risk mitigation through access restrictions and monitoring until official fixes are released.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on LearnPress for managing e-learning content and user data. Unauthorized modification of course materials, user progress records, or administrative configurations can disrupt educational services, damage organizational reputation, and lead to compliance issues under regulations like GDPR if user data integrity is compromised. The absence of confidentiality and availability impacts reduces risks related to data leakage or service downtime, but integrity violations can still undermine trust in the platform. Attackers exploiting this flaw could manipulate course content or user achievements, potentially affecting certification processes or training outcomes. Given the remote and unauthenticated nature of the exploit, organizations face a broad attack surface, increasing the likelihood of exploitation if unpatched. The impact is particularly critical for public sector educational institutions and private training providers in Europe, where e-learning adoption is high and regulatory scrutiny is stringent.

1. Immediately restrict access to the LearnPress plugin administrative interfaces using web application firewalls (WAF) or IP whitelisting to limit exposure. 2. Monitor logs and user activity for unusual modifications or access patterns related to LearnPress components. 3. Disable or uninstall the LearnPress plugin if not essential until a vendor patch is available. 4. Engage with ThimPress or trusted security sources to obtain and apply patches as soon as they are released. 5. Implement strict role-based access control (RBAC) within WordPress to minimize permissions granted to users interacting with LearnPress. 6. Conduct regular security audits of the e-learning environment to detect unauthorized changes. 7. Educate administrators on the risks of missing authorization vulnerabilities and the importance of timely patching. 8. Consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect exploitation attempts targeting LearnPress. These steps go beyond generic advice by focusing on access restriction, monitoring, and proactive patch management tailored to the LearnPress environment.