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

·Source: The Hacker News

Updated:

Executive Summary

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,

Analysis

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,

Indicators of Compromise (1)

CVE (1)
CVE-2026-66066
NVDMITRE CVE
Source Attribution

Originally published by The Hacker News on Jul 29, 2026.

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