Critical Rails Flaw Could Let Unauthenticated Attackers Read Server Files via Image Uploads

Organization: info@thehackernews.com (The Hacker News)

Location: Global

Source: info@thehackernews.com (The Hacker News)

Ruby on Rails has released fixes for a critical Active Storage vulnerability that could let unauthenticated attackers read arbitrary files from application servers through crafted image uploads. Tracked as CVE-2026-66066 (CVSS score: 9.5), the flaw can expose the Rails process environment and secrets such as secret_key_base, the Rails master key, database passwords, cloud storage credentials,


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