CVE-2026-34370 Chamilo LMS: IDOR in the Notebook Module allows an attacker to view other users' private notes
Authenticated students can view other users' private course notes by manipulating the notebook ID, exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-34370?
CVE-2026-34370 is a medium-severity missing authorization vulnerability in Chamilo Chamilo Lms, published on 14 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-34370?
It affects 1 product.
Products include Chamilo Chamilo Lms.
How do I fix CVE-2026-34370?
No fix has been published for CVE-2026-34370 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-34370 being exploited?
There is no known exploitation of CVE-2026-34370 in the wild and no public exploit code.
Other vulnerabilities in Chamilo Chamilo Lms
Sources
Also known as GHSA-fm35-2hvw-564q.