Vulnerability · Published Apr 14, 2026 · Assigned by GitHub_M

CVE-2026-34370Chamilo LMS: IDOR in the Notebook Module allows an attacker to view other users' private notes

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in chamilo-lms from chamilo. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 86.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
chamilo	chamilo-lms	< 2.0.0-RC.3

Weakness: CWE-285, CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-fm35-2hvw-564q x_refsource_CONFIRM
https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3 x_refsource_MISC