Guardian language-system passes the id GET parameter directly into an unsanitized SQL query in media.php (line 17): SELECT id, filename, extension, type, duration, owner, private FROM files where id = '".$_GET['id']."'. An authenticated attacker can perform error-based SQL injection to extract database contents.
Exploitability
AV:NAC:LAT:NPR:NUI:NVulnerable System
VC:HVI:HVA:HSubsequent System
SC:NSI:NSA:N9.3/CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NInjection