Moodle 1.6-1.6.9 1.7-1.7.7 1.8-1.8.9 1.9-1.9.5 - Arbitrary File Read via TeX Filter Input Command
The TeX filter in Moodle 1.6 before 1.6.9+, 1.7 before 1.7.7+, 1.8 before 1.8.9, and 1.9 before 1.9.5 allows user-assisted attackers to read arbitrary files via an input command in a "$$" sequence, which causes LaTeX to include the contents of the file.