Kernel (kernel.sh) breach: leaked API key led to logging data theft and cryptominers on browser servers

Teaser from the source

Browser-infrastructure provider Kernel (kernel.sh) disclosed on Nov 4 2026 that an attacker used a compromised Kernel API key from Oct 24, then on Oct 27 used it to reach a staff login at Kernel's logging provider and downloaded data that included a small number of Kernel API keys and app deployments' third-party secrets. On Nov 3 the same party used a compromised hosting-provider credential to access four GPU servers, three of which ran Kernel browser sessions, and tried to start cryptominers. Kernel says 0.28% of customers were affected, revoked and rotated the credentials, took the servers offline, and notified affected organizations. It believes the financially motivated actor was using the AI-assisted pentesting platform ARTEX. Kernel customers should follow any notice they got, rotate Kernel API keys and the third-party secrets used in their deployments, and prefer scoped keys.

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