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.
https://github.com/advisories/GHSA-wpq5-q3mj-8f3r
https://moodle.org/mod/forum/discuss.php?d=275162
http://www.securitytracker.com/id/1031215
http://openwall.com/lists/oss-security/2014/11/17/11
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-47924