A group of security researchers in Poland say they have discovered a long list of vulnerabilities in the Google App Engine, some of which enable an attacker to escape the Java sandbox. The researchers at Security Explorations say that they have found more than 30 vulnerabilities. The platform allows users to run apps built in a variety of languages, including Python and Java, and frees customers from having to deal with server maintenance and other details. While the researchers were performing their tests on the platform, Google suspended the test account that they had set up.
Source: https://threatpost.com/several-vulnerabilities-found-in-google-app-engine/109749/