Web2py versions 2.14.5 and below was affected by Reflected XSS vulnerability, which allows an attacker to perform an XSS attack on logged in user (admin).
https://www.exploit-db.com/exploits/39821/
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-5790
http://packetstormsecurity.com/files/137070/Web2py-2.14.5-CSRF-XSS-Local-File-Inclusion.html