Chamilo LMS before 1.11.42 and 3.0.0 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious script payloads into survey answers by computing deterministic invitation codes and bypassing authorization checks in the survey submission endpoint. Attackers can submit crafted answers containing unescaped HTML rendered in reporting views to execute arbitrary scripts in the browser sessions of teachers or administrators, enabling persistent backdoor account creation by exploiting the victim's authenticated session.

Chamilo LMS versions 1.11.38 and earlier contain a stored cross-site scripting vulnerability in the user registration form that allows any unauthenticated attacker to execute arbitrary JavaScript in an administrator's browser session, leading to full platform admin account takeover. This has been patched in 1.11.40.

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::removeXSS() to the datestart and dateend parameters in the getuserregistrationbymonth action, the same parameters remain unsanitized in the usersactive 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.

Chamilo LMS is an open-source learning management system. In version 2.0-RC.2, the file public/main/inc/ajax/install.ajax.php is accessible without authentication on fully installed instances because, unlike other AJAX endpoints, it does not include the global.inc.php file that performs authentication and installation-completed checks. Its testmailer action accepts an arbitrary Symfony Mailer DSN string from POST data and uses it to connect to an attacker-specified SMTP server, enabling Server-Side Request Forgery (SSRF) into internal networks via the SMTP protocol. An unauthenticated attacker can also abuse this to weaponize the Chamilo server as an open email relay for phishing and spam campaigns, with emails appearing to originate from the server's IP address. Additionally, error responses from failed SMTP connections may disclose information about internal network topology and running services. This issue has been fixed in version 2.0.0-RC.3.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, a Stored Cross-Site Scripting (XSS) vulnerability exists in the social post attachment upload functionality, where an authenticated user can upload a malicious HTML file containing JavaScript via the /api/socialpostattachments endpoint. The uploaded file is served back from the application at the generated contentUrl without sanitization, content type restrictions, or a Content-Disposition: attachment header, causing the JavaScript to execute in the browser within the application's origin. Because the payload is stored server-side and runs in the trusted origin, an attacker can perform session hijacking, account takeover, privilege escalation (if an admin views the link), and arbitrary actions on behalf of the victim. This issue has been fixed in version 2.0.0-RC.3.

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.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the /api/courserelusers endpoint is vulnerable to Insecure Direct Object Reference (IDOR), allowing an authenticated attacker to modify the user parameter in the request body to enroll any arbitrary user into any course without proper authorization checks. The backend trusts the user-supplied input for the user field and performs no server-side verification that the requester owns the referenced user ID or has permission to act on behalf of other users. This enables unauthorized manipulation of user-course relationships, potentially granting unintended access to course materials, bypassing enrollment controls, and compromising platform integrity. This issue has been fixed in version 2.0.0-RC.3.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the notebook module contains an Insecure Direct Object Reference (IDOR) vulnerability that allows any authenticated student to read the private course notes of any other user on the platform by manipulating the notebookid parameter in the editnote action. The application fetches the note content using only the supplied integer ID without verifying that the requesting user owns the note, and the full title and HTML body are rendered in the edit form and returned to the attacker's browser. While ownership checks exist in the write paths (updateNote() and deletenote()), they are entirely absent from the read path (getnoteinformation()). This issue has been fixed in version 2.0.0-RC.3.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, an OS Command Injection vulnerability exists in the main/inc/ajax/gradebook.ajax.php endpoint within the exportallcertificates action, where the course code retrieved from the session variable $SESSION['cid'] via apigetcourseid() is concatenated directly into a shellexec() command string without sanitization or escaping using escapeshellarg(). If an attacker can manipulate or poison their session data to inject shell metacharacters into the cid variable, they can achieve arbitrary command execution on the underlying server. Successful exploitation grants full access to read system files and credentials, alters the application and database, or disrupts server availability. This issue has been fixed in version 2.0.0-RC.3.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, an insecure direct object modification vulnerability in the PUT /api/users/{id} endpoint allows any authenticated user with ROLESTUDENT to escalate their privileges to ROLEADMIN by modifying the roles field on their own user record. The API Platform security expression isgranted('EDIT', object) only verifies record ownership, and the roles field is included in the writable serialization group, enabling any user to set arbitrary roles such as ROLEADMIN. Successful exploitation grants full administrative control of the platform, including access to all courses, user data, grades, and administrative settings. This issue has been fixed in version 2.0.0-RC.3.

An arbitrary file upload vulnerability in the /fileUpload.lib.php component of Chamilo 1.11. up to v1.11.18 allows attackers to execute arbitrary code via uploading a crafted SVG file.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via a crafted payload to the My Progress function.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via a crafted payload to the personal notes function.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the resource sequencing parameters.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the skills wheel parameter.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the course category parameters.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the forum title parameter.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local authenticated attacker to execute arbitrary code via the homepage function.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the skype and linedinurl parameters.

Cross Site Scripting vulnerability found in Chamilo Lms v.1.11.18 allows a local attacker to execute arbitrary code via the system annnouncements parameter.

Incorrect access control in Chamilo v1.11.x up to v1.11.18 allows a student to arbitrarily access and modify another student's personal notes.

Chamilo v1.11.x up to v1.11.18 was discovered to contain a cross-site scripting (XSS) vulnerability via the /feedback/comment field.

Incorrect access control in Chamilo 1.11. up to 1.11.18 allows a student subscribed to a given course to download documents belonging to another student if they know the document's ID.

An issue in Chamilo v1.11. up to v1.11.18 allows attackers to execute a Server-Side Request Forgery (SSRF) and obtain information on the services running on the server via crafted requests in the social and links tools.

A Chamilo LMS 1.11.14 reflected XSS vulnerability exists in main/social/search.php=q URI (social network search feature).

A user without privileges in Chamilo LMS 1.11.14 can send an invitation message to another user, e.g., the administrator, through main/social/search.php, main/inc/lib/social.lib.php and steal cookies or execute arbitrary code on the administration side via a stored XSS vulnerability via social network the send invitation feature.

SQL injection vulnerability in the checkuserpassword function in main/auth/profile.php in Chamilo LMS 1.9.6 and earlier, when using the non-encrypted passwords mode set at installation, allows remote authenticated users to execute arbitrary SQL commands via the "password0" parameter.

Chamilo LMS is a learning management system. From 1.11.0 to 2.0-beta.1, anyone can trigger a malicious redirect through the use of the redirect parameter to /login. This vulnerability is fixed in 2.0-beta.2.

Chamilo LMS is a learning management system. Prior to .0.0-RC.3, the PlatformConfigurationController::decodeSettingArray() method uses PHP's eval() to parse platform settings from the database. An attacker with admin access (obtainable via Advisory 1) can inject arbitrary PHP code into the settings, which is then executed when any user (including unauthenticated) requests /platform-config/list. This vulnerability is fixed in 2.0.0-RC.3.

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, in main/lp/aicchacp.php, user-controlled request parameters are directly used to set the PHP session ID before loading global bootstrap. This leads to session fixation. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.