Multiple cross-site request forgery (CSRF) vulnerabilities in the Forum module in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 allow remote attackers to hijack the authentication of arbitrary users for requests that set a tracking preference within (1) mod/forum/deprecatedlib.php, (2) mod/forum/forum.js, (3) mod/forum/index.php, or (4) mod/forum/lib.php.

lib/phpunit/bootstrap.php in Moodle 2.6.x before 2.6.6 and 2.7.x before 2.7.3 allows remote attackers to obtain sensitive information via a direct request, which reveals the full path in an error message.

mod/data/edit.php in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 sets a certain group ID to zero upon a database-entry change, which allows remote authenticated users to obtain sensitive information by accessing the database after an edit by a teacher.

mod/wiki/admin.php in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 allows remote authenticated users to remove wiki pages by leveraging delete access within a different subwiki.

webservice/upload.php in Moodle 2.6.x before 2.6.6 and 2.7.x before 2.7.3 does not ensure that a file upload is for a private or draft area, which allows remote authenticated users to upload files containing JavaScript, and consequently conduct cross-site scripting (XSS) attacks, by specifying the profile-picture area.

Cross-site scripting (XSS) vulnerability in mod/feedback/mapcourse.php in the Feedback module in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 allows remote authenticated users to inject arbitrary web script or HTML by leveraging the mod/feedback:mapcourse capability to provide a searchcourse parameter.

Multiple cross-site request forgery (CSRF) vulnerabilities in the LTI module in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 allow remote attackers to hijack the authentication of arbitrary users for a (1) mod/lti/request_tool.php or (2) mod/lti/instructor_edit_tool_type.php request.

The LTI module in Moodle through 2.4.11, 2.5.x before 2.5.9, 2.6.x before 2.6.6, and 2.7.x before 2.7.3 does not properly restrict the parameters used in a return URL, which allows remote attackers to trigger the generation of arbitrary messages via a modified URL, related to mod/lti/locallib.php and mod/lti/return.php.

mod/forum/externallib.php in Moodle 2.6.x before 2.6.6 and 2.7.x before 2.7.3 does not verify group permissions, which allows remote authenticated users to access a forum via the forum_get_discussions web service.

lib/classes/grades_external.php in Moodle 2.7.x before 2.7.3 does not consider the moodle/grade:viewhidden capability before displaying hidden grades, which allows remote authenticated users to obtain sensitive information by leveraging the student role to access the get_grades web service.