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

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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id: 2297
uid: kVaMU
insdate: 2026-07-29 19:10:05
title: Critical Rails Flaw Could Let Unauthenticated Attackers Read Server Files via Image Uploads
additional: 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,
category: Cybersecurity
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guid: https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html
source_url: https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html
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