Chamilo LMS up to 2.0-RC.2 Exchange Notification Service pens.php package-url missing authentication

Summaryinfo

A vulnerability marked as critical has been reported in Chamilo LMS up to 2.0-RC.2. This affects an unknown function of the file public/plugin/Pens/pens.php of the component Exchange Notification Service. Performing a manipulation of the argument package-url results in missing authentication. This vulnerability is known as CVE-2026-34160. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Chamilo LMS up to 2.0-RC.2. It has been classified as critical. This affects an unknown code of the file public/plugin/Pens/pens.php of the component Exchange Notification Service. The manipulation of the argument package-url with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality. The summary by CVE is:

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the PENS (Package Exchange Notification Services) plugin endpoint at public/plugin/Pens/pens.php is accessible without authentication and accepts a user-controlled package-url parameter that the server fetches using curl without filtering private or internal IP addresses, enabling unauthenticated Server-Side Request Forgery (SSRF). An attacker can exploit this to probe internal network services, access cloud metadata endpoints (such as 169.254.169.254) to steal IAM credentials and sensitive instance metadata, or trigger state-changing operations on internal services via the receipt and alerts callback parameters. No authentication is required to exploit either SSRF vector, significantly increasing the attack surface. This issue has been fixed in version 2.0.0-RC.3.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-34160 since 03/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

By approaching the search of inurl:public/plugin/Pens/pens.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.0-RC.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch de4058d76fac2413afd023b1ec942e8e79579011 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Content Management System

Vendor

• Chamilo

Name

• LMS

Version

• 2.0-RC.0
• 2.0-RC.1
• 2.0-RC.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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