CVE-2026-104403 in LearnPress Plugin
Summary
by MITRE • 10/02/2026
Authorization Bypass Through User-Controlled Key vulnerability in ThimPress LearnPress allows Exploiting Incorrectly Configured Access Control Security Levels.
This issue affects LearnPress: from n/a through 4.4.9.
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Analysis
by VulDB Data Team • 10/02/2026
The vulnerability identified as an Authorization Bypass Through User-Controlled Key within the LearnPress plugin represents a critical flaw in access control mechanisms, specifically affecting versions ranging from initial releases up to version 4.4.9. This security issue stems from improper validation of user-supplied input used as keys for accessing sensitive resources or administrative functions. In typical WordPress environments, plugins often rely on specific identifiers such as post IDs, course IDs, or enrollment tokens to determine whether a requesting user has the necessary permissions to perform an action. When these identifiers are directly derived from user-controlled parameters without adequate server-side verification of ownership or role-based privileges, attackers can manipulate these keys to access data belonging to other users or execute administrative actions they should not be permitted to perform. This type of flaw is fundamentally rooted in a failure to enforce proper object-level authorization checks, allowing malicious actors to bypass intended security boundaries by simply altering the key value passed through HTTP requests.
From a technical perspective, this vulnerability aligns closely with Common Weakness Enumeration (CWE) categories such as CWE-284 Improper Access Control and CWE-639 Authorization Bypass Through User-Controlled Key. The core issue lies in the application logic assuming that possession of a valid identifier equates to authorization for all operations associated with that identifier, rather than verifying if the current session or user context is actually permitted to interact with that specific resource. In the context of LearnPress, which manages online courses and student progress, this could allow an authenticated attacker who has lower privileges, such as a standard student, to access course materials belonging to other students, view private quiz answers, manipulate enrollment statuses, or potentially escalate their privilege level if administrative keys are similarly exposed. The lack of strict ownership verification means that the application does not cross-reference the requested resource with the identity and permissions of the authenticated user making the request.
The operational impact of this vulnerability is significant for any organization relying on LearnPress to deliver secure educational content. An attacker can exploit this flaw to conduct unauthorized data exfiltration, compromising student privacy by accessing personal information or academic records stored within course modules. Furthermore, if administrative endpoints are accessible through similar key manipulation techniques, the integrity of the entire learning management system could be compromised, allowing for grade tampering, unauthorized creation of courses, or disruption of service. This undermines trust in the platform and exposes institutions to potential regulatory penalties under data protection laws such as GDPR or FERPA due to the exposure of sensitive educational records. The ease of exploitation means that even attackers with minimal technical expertise can leverage automated tools to iterate through keys and discover accessible resources, making this a high-risk vulnerability for widespread deployment scenarios.
Mitigation strategies must focus on implementing robust server-side authorization checks that verify both the existence of the resource and the user's right to access it based on their role and ownership relationships. Developers should ensure that all API endpoints and administrative functions within LearnPress validate the current user context against the requested resource ID, rejecting requests where there is no explicit permission linkage. Upgrading to a patched version of the plugin beyond 4.4.9 is the primary remediation step provided by the vendor, as these updates typically include fixes for such access control logic errors. Additionally, administrators should enforce strict input validation and utilize security headers or Web Application Firewalls (WAFs) that can detect patterns indicative of key manipulation attacks. Regular security audits focusing on object-level authorization flows are recommended to identify similar weaknesses in other plugins integrated with the WordPress ecosystem, ensuring a defense-in-depth approach against unauthorized access attempts classified under MITRE ATT&CK techniques related to privilege escalation and data exfiltration.