How Cloudflare addressed a cross-tenant data exposure vulnerability in Containers
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Perfect match: detailed cloud security postmortem on cross-tenant container vulnerabilities.
Summary
On September 4, 2026, Oren Yomtov, a security researcher from Accomplish , responsibly reported a vulnerability affecting Cloudflare Containers and Cloudflare Sandboxes (which is built on Containers), through Cloudflare’s bug bounty program . Cloudflare has fully remediated the vulnerability, and we have no evidence that customer data has been compromised. This post was prepared in collaboration with Oren Yomtov and the Accomplish security research team, whose detailed report and controlled testing helped us validate the issue and respond quickly.