# CVE-2026-34239: Chamilo LMS remote code execution in lang.ajax.php

Source: https://junglewise.ai/threats/cve-2026-34239-chamilo-lms-remote-code-execution-in-lang-ajax-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-20. Updated: 2026-07-20  
License: CC BY 4.0 with a link back

CVE-2026-34239 · Severity: info · CVSS 7.5 · Published 2026-07-20

Chamilo LMS, a popular open-source learning management system, contains a security flaw that allows authenticated users to execute arbitrary commands on the server. This means any user enrolled in a course—including students or teachers—could potentially take full control of the platform, leading to the theft of sensitive student data, modification of course content, or a complete shutdown of the learning service. The issue stems from insufficient access controls on a specific internal script used for language translations.

## Quick answers

**Is CVE-2026-34239 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34239 being exploited in the wild.

**How severe is CVE-2026-34239?** Informational severity, with a CVSS score of 7.5, published 20 July 2026.

**Which products and versions are affected?** Chamilo Chamilo LMS <= 1.11.40.

**Is there a fix for CVE-2026-34239?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-34239 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-34239?** Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An authenticated remote code execution (RCE) vulnerability exists in Chamilo LMS versions up to and including 1.11.40. The vulnerability is located in the `main/inc/ajax/lang.ajax.php` script, specifically within the `translate_portfolio_category` function. The endpoint is insufficiently protected by `api_protect_course_script(true)`, which fails to verify administrative privileges. Consequently, any authenticated user enrolled in a course (such as a student, teacher, or DRH) can access the endpoint. An attacker can leverage this improper authorization (CWE-285) to execute arbitrary code on the underlying server. The attack complexity is rated as high, and it requires high privileges (authenticated user status).

## Affected products

- Chamilo Chamilo LMS <= 1.11.40

## Timeline

- 2026-07-07: advisory: Original GitHub security advisory published
- 2026-07-20: disclosed: CVE published to NVD dataset

## References

- [https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-4hwq-pv7c-3928](https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-4hwq-pv7c-3928)