Critical Ruby on Rails Active Storage Vulnerability (CVE-2026-66066)

[Eyal Estrin]

Akamai Security Research
https://www.akamai.com/blog/security-research/rails-active-storage-rce-cve-2026-66066

Rapid7 Emergent Threat Response
https://www.rapid7.com/blog/post/etr-kindarails2shell-cve-2026-66066-critical-arbitrary-file-read-and-possible-remote-code-execution-in-ruby-on-rails/

HeroDevs Security Blog
https://www.herodevs.com/blog-posts/cve-2026-66066-rails-active-storage-arbitrary-file-read-and-rce

InfoWorld News
https://www.infoworld.com/article/4205407/ruby-on-rails-critical-bug-puts-every-image-upload-under-scrutiny-2.html

Eyal Estrin
Author | Cloud Architect | AWS • Azure • GCP Insights
Social: @eyalestrin
Connect: https://linktr.ee/eyalestrin Blog: https://security-24-7.com