Arbitrary file upload in Chamilo LMS - CVE-2026-29041
Published: April 24, 2026
Vulnerability identifier: #VU127539
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-29041
CWE-ID: CWE-434
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Chamilo
Affected software:
Chamilo LMS
Chamilo LMS
Detailed vulnerability description
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper validation of uploaded files in the main/inc/ajax/document.ajax.php endpoint when handling the ck_uploadimage action. A remote user can upload a crafted file containing executable code and access it via the browser to execute arbitrary code.
Only deployments with the $_configuration['enable_uploadimage_editor'] configuration option enabled are vulnerable.
How to mitigate CVE-2026-29041
Install security update from vendor's website.