{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/vendors/ruby/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["Ruby","Ruby on Rails"],"_cs_severities":["critical"],"_cs_tags":["code-execution","ruby","rails"],"_cs_type":"advisory","_cs_vendors":["Ruby","Rails"],"content_html":"\u003cp\u003eA vulnerability exists in Ruby and Ruby on Rails that allows a remote, anonymous attacker to bypass security measures and execute arbitrary code. This vulnerability stems from an unspecified flaw within the \u003ccode\u003eerb\u003c/code\u003e gem, a templating engine used by Rails and other Ruby applications. The lack of specific CVE identification makes precise targeting difficult, but exploitation could lead to complete system compromise if successful. Defenders should prioritize monitoring for suspicious activity related to Ruby and Rails applications.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a Ruby or Ruby on Rails application utilizing the \u003ccode\u003eerb\u003c/code\u003e gem.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious input designed to exploit the vulnerability in the \u003ccode\u003eerb\u003c/code\u003e gem. This input is often injected through user-supplied data, such as form fields or API requests.\u003c/li\u003e\n\u003cli\u003eThe attacker sends the crafted input to the vulnerable application, potentially through a web request.\u003c/li\u003e\n\u003cli\u003eThe application processes the malicious input using the \u003ccode\u003eerb\u003c/code\u003e gem, leading to code execution.\u003c/li\u003e\n\u003cli\u003eThe attacker gains the ability to execute arbitrary commands on the server running the application.\u003c/li\u003e\n\u003cli\u003eThe attacker uses the initial access to escalate privileges on the system.\u003c/li\u003e\n\u003cli\u003eThe attacker deploys persistent backdoors for continued access.\u003c/li\u003e\n\u003cli\u003eThe attacker pivots to other systems on the network or exfiltrates sensitive data.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows a remote attacker to execute arbitrary code on the affected system. This can lead to complete system compromise, data theft, and further lateral movement within the network. The lack of detailed reporting makes it difficult to assess the scale of prior attacks.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEnable detailed logging for your Ruby and Ruby on Rails applications, specifically focusing on web requests and application logs to detect suspicious activity related to the \u003ccode\u003eerb\u003c/code\u003e gem.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules provided in this brief to your SIEM to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for unusual outbound connections originating from Ruby or Ruby on Rails application servers (see network connection rule below).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-15T08:36:34Z","date_published":"2026-05-15T08:36:34Z","id":"https://feed.craftedsignal.io/briefs/2026-05-ruby-rails-code-execution/","summary":"A remote, anonymous attacker can exploit a vulnerability in Ruby and Ruby on Rails to bypass security measures and execute arbitrary code.","title":"Ruby and Ruby on Rails Vulnerability Allows Code Execution","url":"https://feed.craftedsignal.io/briefs/2026-05-ruby-rails-code-execution/"}],"language":"en","title":"CraftedSignal Threat Feed — Ruby","version":"https://jsonfeed.org/version/1.1"}