Chamilo is a learning management system. Prior to version 1.11.30, there is a reflected cross-site scripting (XSS) vulnerability due to insufficient sanitization of the page parameter in the session/add_users_to_session.php endpoint. This issue has been patched in version 1.11.30.
Exploitability
AV:NAC:LAT:NPR:NUI:AVulnerable System
VC:NVI:LVA:NSubsequent System
SC:NSI:NSA:N5.1/CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:NInjection