mod/lti/service.php in Moodle through 2.3.11, 2.4.x before 2.4.11, 2.5.x before 2.5.7, 2.6.x before 2.6.4, and 2.7.x before 2.7.1 allows remote attackers to read arbitrary files via an XML external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
https://github.com/advisories/GHSA-xmwv-mqh8-4xgw
https://moodle.org/mod/forum/discuss.php?d=264263
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-5831
http://openwall.com/lists/oss-security/2014/07/21/1
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-45463