CVE-2026-30887
CRITICAL
GHSA-h343-gg57-2q67
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4Description
OneUptime is a solution for monitoring and managing online services. Prior to 10.0.18, OneUptime allows project members to run custom Playwright/JavaScript code via Synthetic Monitors to test websites. However, the system executes this untrusted user code inside the insecure Node.js vm module. By leveraging a standard prototype-chain escape (this.constructor.constructor), an attacker can bypass the sandbox, gain access to the underlying Node.js process object, and execute arbitrary system commands (RCE) on the oneuptime-probe container. Furthermore, because the probe holds database/cluster credentials in its environment variables, this directly leads to a complete cluster compromise. This vulnerability is fixed in 10.0.18.
Analysis
OneUptime monitoring platform prior to 10.0.18 allows code injection (CVSS 9.9) enabling RCE through the monitoring configuration.
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Remediation
Within 24 hours: Audit all OneUptime project members and revoke access for unnecessary accounts; document all Synthetic Monitor configurations currently in use. Within 7 days: Implement network segmentation to isolate OneUptime instances from critical systems; disable Synthetic Monitor custom code execution if operationally feasible; escalate with vendor for emergency patched release timeline. …
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External POC / Exploit Code
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