CVE-2023-3533

Chamilo LMS Unauthenticated Remote Code Execution via Arbitrary File Write

9.8 Critical

Path traversal in file upload functionality in /main/webservices/additional_webservices.php in Chamilo LMS <= v1.11.20 allows unauthenticated attackers to perform stored cross-site scripting attacks and obtain remote code execution via arbitrary file write.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.50%Up 3.4 points since Nov 28, 2023

What each source reports

CVE List Score used 9.8

Chamilo LMS Unauthenticated Remote Code Execution via Arbitrary File Write

Record: CVE-2023-3533
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-22
Updated: 2026-11-02

EUVDEUVD-2023-44189 9.8

Record: EUVD-2023-44189
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-28gg-m25v-q74w 9.8

Path traversal in file upload functionality in `/main/webservices/additional_webservices.php` in...

Record: GHSA-28gg-m25v-q74w
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-22
Updated: 2026-11-02

NVD 9.8

Record: CVE-2023-3533
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-22
Updated: 2026-11-02

OSV 9.8

Chamilo LMS Unauthenticated Remote Code Execution via Arbitrary File Write

Record: CVE-2023-3533
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-22
Updated: 2026-11-02

Affected products

chamilo

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-3533 is a critical vulnerability (CVSS 9.8) in Chamilo, published November 28, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.50%, the 89th percentile. No source names a fixed version.