CVE-2019-5420

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.

• CWE-77
• CWE-330

• http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
• https://groups.google.com/forum/#%21topic/rubyonrails-security/IsQKvDqZdKw
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/
• https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/Patch, Vendor Advisory
• https://www.exploit-db.com/exploits/46785/Exploit, Third Party Advisory, VDB Entry
• http://packetstormsecurity.com/files/152704/Ruby-On-Rails-DoubleTap-Development-Mode-secret_key_base-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
• https://groups.google.com/forum/#%21topic/rubyonrails-security/IsQKvDqZdKw
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y43636TH4D6T46IC6N2RQVJTRFJAAYGA/
• https://weblog.rubyonrails.org/2019/3/13/Rails-4-2-5-1-5-1-6-2-have-been-released/Patch, Vendor Advisory
• https://www.exploit-db.com/exploits/46785/Exploit, Third Party Advisory, VDB Entry

Published

Mar 27, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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