Chamilo up to 1.11.40 lang lang.ajax.php privilege escalation

Summaryinfo

A vulnerability described as critical has been identified in Chamilo up to 1.11.40. Affected by this issue is some unknown functionality of the file main/inc/ajax/lang.ajax.php of the component lang. The manipulation results in Remote Privilege Escalation. This vulnerability is known as CVE-2026-34239. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Chamilo up to 1.11.40. Affected is an unknown code block of the file main/inc/ajax/lang.ajax.php of the component lang. The manipulation with an unknown input leads to a remote privilege escalation vulnerability. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Chamilo version 1.11.40 and earlier are vulnerable to authenticated remote code execution in the main/inc/ajax/lang.ajax.php path. This endpoint is protected only by `api_protect_course_script(true)`, which means any authenticated user enrolled in a course (student, teacher, DRH) can reach it.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-34239 since 03/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 07/20/2026).

By approaching the search of inurl:main/inc/ajax/lang.ajax.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Content Management System

Name

• Chamilo

Version

• 1.11.0
• 1.11.1
• 1.11.2
• 1.11.3
• 1.11.4
• 1.11.5
• 1.11.6
• 1.11.7
• 1.11.8
• 1.11.9
• 1.11.10
• 1.11.11
• 1.11.12
• 1.11.13
• 1.11.14
• 1.11.15
• 1.11.16
• 1.11.17
• 1.11.18
• 1.11.19
• 1.11.20
• 1.11.21
• 1.11.22
• 1.11.23
• 1.11.24
• 1.11.25
• 1.11.26
• 1.11.27
• 1.11.28
• 1.11.29
• 1.11.30
• 1.11.31
• 1.11.32
• 1.11.33
• 1.11.34
• 1.11.35
• 1.11.36
• 1.11.37
• 1.11.38
• 1.11.39
• 1.11.40

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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