The sample web application in web2py before 2.14.2 might allow remote attackers to execute arbitrary code via vectors involving use of a hardcoded encryption key when calling the session.connect function.
https://github.com/advisories/GHSA-q2rq-qgcf-m22w
https://usn.ubuntu.com/4030-1/
https://github.com/web2py/web2py/blob/R-2.14.1/applications/examples/models/session.py
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-4863
https://devco.re/blog/2017/01/03/web2py-unserialize-code-execution-CVE-2016-3957/