CVE-2026-39385 in LMS
Summary
by MITRE • 07/20/2026
Frappe LMS is an open source learning management system. In version 2.51.0 and earlier, a user could bypass payment validation for courses by using unrelated batch. This has been patched in 2.52.0 with enrollment now validating that the batch is linked to course.
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Analysis
by VulDB Data Team • 07/20/2026
The vulnerability in Frappe LMS versions 2.51.0 and earlier represents a critical access control flaw that undermines the system's commercial integrity and revenue protection mechanisms. This issue stems from insufficient validation during the course enrollment process where users could exploit a logical gap in the batch-course relationship verification. The flaw allows malicious actors to bypass payment requirements by manipulating batch enrollment parameters, effectively gaining access to paid course content without proper authorization.
The technical implementation of this vulnerability resides in the enrollment validation logic that fails to properly verify the relationship between batches and courses within the system's data model. When users attempt to enroll in courses, the system should validate that the selected batch is explicitly linked to the target course before permitting access. However, prior to the patch in version 2.52.0, this validation was incomplete or absent entirely, allowing unauthorized enrollment through unrelated batch associations. This represents a classic case of inadequate input validation and insufficient authorization checks that aligns with CWE-639 weakness category focusing on insufficient authorization controls.
The operational impact of this vulnerability extends beyond simple revenue loss, creating potential security risks for educational institutions and content providers using the platform. Attackers could systematically exploit this flaw to access premium course materials across multiple installations, potentially leading to widespread unauthorized access and intellectual property theft. The vulnerability affects the core commercial functionality of the learning management system, undermining trust in the platform's payment processing mechanisms and potentially exposing sensitive user data associated with enrollment transactions.
This vulnerability demonstrates the importance of proper data integrity checks and relationship validation within educational technology platforms. The fix implemented in version 2.52.0 addresses the root cause by strengthening the enrollment validation process to ensure that batch associations are properly verified against course requirements before granting access. This remediation aligns with ATT&CK technique T1078.004 related to valid accounts and proper access control enforcement. Organizations should prioritize updating to version 2.52.0 or later to mitigate this risk, while also implementing additional monitoring for suspicious enrollment patterns that might indicate attempted exploitation of similar validation gaps in other system components.
The incident highlights broader security considerations for open source learning management systems where commercial features must maintain robust protection mechanisms against unauthorized access attempts. Proper implementation of data validation controls and relationship integrity checks becomes critical when dealing with paid content delivery systems. Organizations using Frappe LMS should conduct thorough security assessments to identify potential similar vulnerabilities in their deployment configurations and ensure that all enrollment-related processes maintain proper authorization validation before granting access to premium course materials.