CVE-2026-86447 in LearnPress Plugin
Summary
by MITRE • 09/16/2026
The LearnPress WordPress plugin before 4.4.7 does not check the user's capabilities in one of its administrative course tools, allowing unauthenticated attackers to list every enrolled student's display name and user identifier against the course they are enrolled on, and to recover their email addresses through the same handler's search filter.
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Analysis
by VulDB Data Team • 09/16/2026
The vulnerability identified in LearnPress versions prior to 4.4.7 represents a critical failure in access control mechanisms within an administrative feature of the WordPress plugin ecosystem. This specific flaw stems from the absence of proper capability verification for functions intended exclusively for users with elevated privileges, such as course instructors or site administrators. In secure software architecture, any endpoint that exposes sensitive data regarding user enrollment must strictly validate that the requesting entity possesses the necessary permissions to view such information. The failure to implement these checks allows unauthenticated actors to interact directly with internal API endpoints and administrative handlers without providing valid credentials or session tokens, effectively bypassing the authentication layer entirely.
From a technical perspective, the exploitation vector relies on the direct invocation of search filter functions within the course management tools. These handlers are designed to retrieve student data for legitimate administrative purposes but lack input validation regarding the requester's identity. By sending crafted HTTP requests to these endpoints, an attacker can trigger the underlying database queries that return structured data containing enrolled students' display names and unique user identifiers associated with specific courses. Furthermore, the same handler includes a search filter mechanism that inadvertently exposes email addresses when queried appropriately. This indicates a broader issue of information disclosure where sensitive personally identifiable information is returned in plaintext responses without any sanitization or permission-based filtering logic to restrict access based on role.
The operational impact of this vulnerability is significant due to the nature of the data exposed. The ability to enumerate enrolled students and their contact details facilitates targeted phishing campaigns, social engineering attacks, and credential stuffing attempts against a specific audience that has demonstrated interest in particular educational content. Additionally, the exposure of user identifiers can aid attackers in mapping out the structure of an organization or institution using the platform, potentially leading to further reconnaissance activities. For institutions relying on LearnPress for professional development or academic courses, this breach compromises student privacy and violates data protection principles by allowing unauthorized parties to harvest contact information at scale without detection or consent.
This vulnerability aligns with CWE-284 Improper Access Control, as the application fails to enforce proper authorization checks before granting access to sensitive resources. It also corresponds to ATT&CK technique T1078 Valid Accounts if an attacker were to use stolen credentials, but in this specific case of unauthenticated access, it reflects a fundamental flaw in API security design often categorized under CWE-639 Authorization Bypass Through User-Controlled Key or similar authorization bypass patterns. The lack of authentication requirement places the severity at high risk for data exposure scenarios within web applications.
To mitigate this vulnerability, administrators must immediately update the LearnPress plugin to version 4.4.7 or later where these access control checks have been implemented by the developers. Until an upgrade is feasible, implementing a Web Application Firewall rule that restricts direct access to known administrative endpoints for non-administrative IP addresses can provide temporary relief. Additionally, reviewing server logs for unusual traffic patterns targeting course-related API endpoints may help identify ongoing exploitation attempts. Long-term remediation should involve adopting secure coding practices that mandate explicit capability verification on all data retrieval functions, ensuring that only authorized roles can query sensitive user metadata within the application environment.