Ruby on Rails Patches Critical Active Storage Vulnerability Affecting Image Processing
Ruby on Rails fixed a critical vulnerability that could let unauthenticated attackers read files and achieve remote code execution. Ruby on Rails has patched CVE-2026-66066, a critical vulnerability (CVSS score of 9.5) that could allow unauthenticated attackers to read arbitrary files from vulnerable servers. In the default configuration, applications that generate image variants may expose […]
Ruby on Rails has patched CVE-2026-66066, a critical vulnerability (CVSS score of 9.5) that could allow unauthenticated attackers to read arbitrary files from vulnerable servers. In the default configuration, applications that generate image variants may expose sensitive data, including environment variables, potentially enabling remote code execution or lateral movement.
“In its default configuration, a Rails application that displays image variants may allow an unauthenticated attacker to read arbitrary files from the server, including the process environment.” reads the advisory. “That environment typically holds secret_key_base and often credentials for external systems, which may in turn allow escalation to remote code execution or lateral movement to those systems.”
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