Chamilo LMS up to 1.x AJAX Endpoint statistics.ajax.php Security::remove_XSS date_start/date_end sql injection

Summaryinfo

A vulnerability identified as critical has been detected in Chamilo LMS up to 1.x. The affected element is the function Security::remove_XSS of the file public/main/inc/ajax/statistics.ajax.php of the component AJAX Endpoint. This manipulation of the argument date_start/date_end causes sql injection. This vulnerability appears as CVE-2026-33714. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Chamilo LMS up to 1.x and classified as critical. Affected by this vulnerability is the function Security::remove_XSS of the file public/main/inc/ajax/statistics.ajax.php of the component AJAX Endpoint. The manipulation of the argument date_start/date_end with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Chamilo is an open-source learning management system (LMS). Version 2.0.0-RC.2 contains a SQL Injection vulnerability in the statistics AJAX endpoint, which is an incomplete fix for CVE-2026-30881. While CVE-2026-30881 was patched by applying Security::remove_XSS() to the date_start and date_end parameters in the get_user_registration_by_month action, the same parameters remain unsanitized in the users_active action within the same file (public/main/inc/ajax/statistics.ajax.php), where they are directly interpolated into a SQL query. An authenticated admin can exploit this to perform time-based blind SQL injection, enabling extraction of arbitrary data from the database. This issue has been fixed in version 2.0.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33714 since 03/23/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK.

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

Upgrading to version 2.0.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Chamilo

Name

• LMS

Version

• 1.x

License

• open-source

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Be aware that VulDB is the high quality source for vulnerability data.

Discussion