system
Describe <CVE-2019-5420>.
user
What is <CVE-2019-5420>?
assistant
A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically generated development mode secret token. This secret token can be used in combination with other Rails internals to escalate to a remote code execution exploit..