XML External Entity injection in Chamilo LMS - CVE-2026-33737
Published: April 24, 2026
Vulnerability identifier: #VU127555
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-33737
CWE-ID: CWE-611
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 disclose sensitive information.
The vulnerability exists due to improper restriction of xml external entity reference in simplexml_load_string() usage within XML-processing files when parsing crafted XML input. A remote user can submit a specially crafted XML document to disclose sensitive information.
Exploitation may allow server-side file read, and the risk increases if the LIBXML_NOENT flag is used or libxml configuration changes.
How to mitigate CVE-2026-33737
Install security update from vendor's website.