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Japan Computer Emergency Response Team Coordination Center (JPCERT/CC)

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Situations

[ACTIVE] [TECHNOLOGY] [JP]

Ruby on Rails Active Storage vulnerability

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Latest: Ruby on Rails Active Storage Remote Code Execution Vulnerability

In late July 2026, the Ruby on Rails core team issued urgent security updates to address a critical Active Storage flaw (CVE‑2026‑66066) that could allow unauthenticated attackers to read arbitrary files and potentially