Chamilo LMS up to 2.0.0-RC.2 Notebook updateNote/delete_note notebook_id improper authorization

Summaryinfo

A vulnerability was found in Chamilo LMS up to 2.0.0-RC.2. It has been rated as critical. The impacted element is the function updateNote/delete_note of the component Notebook Module. This manipulation of the argument notebook_id causes improper authorization. This vulnerability is registered as CVE-2026-34370. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Chamilo LMS up to 2.0.0-RC.2. It has been declared as critical. Affected by this vulnerability is the function updateNote/delete_note of the component Notebook Module. The manipulation of the argument notebook_id with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is:

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the notebook module contains an Insecure Direct Object Reference (IDOR) vulnerability that allows any authenticated student to read the private course notes of any other user on the platform by manipulating the notebook_id parameter in the editnote action. The application fetches the note content using only the supplied integer ID without verifying that the requesting user owns the note, and the full title and HTML body are rendered in the edit form and returned to the attacker's browser. While ownership checks exist in the write paths (updateNote() and delete_note()), they are entirely absent from the read path (get_note_information()). This issue has been fixed in version 2.0.0-RC.3.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-34370 since 03/27/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

Upgrading to version 2.0.0-RC.3 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Vendor

• Chamilo

Name

• LMS

Version

• 2.0.0-RC.0
• 2.0.0-RC.1
• 2.0.0-RC.2

License

• open-source

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CPE 2.2info

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