CVE-2026-27574: OneUptime:: node:vm sandbox escape in probe allows any project member to achieve RCE

OneUptime lets project members write custom JavaScript that runs inside monitors. The problem is it executes that code using Node.js’s built-in vm module, which Node.js itself documents as “not a security mechanism — do not use it to run untrusted code.” The classic one-liner escape gives full access to the underlying process, and since the probe runs with host networking and holds all cluster credentials in its environment, this turns into a full cluster compromise for anyone who can register an account.