EUVD-2026-16820
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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Description
Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs. Workspace environment variable values are interpolated into JavaScript string literals without escaping single quotes in the NativeTS executor. A workspace admin who sets a custom environment variable with a value containing `'` can inject arbitrary JavaScript that executes inside every NativeTS script in that workspace. This is a code injection bug in `worker.rs`, not related to the sandbox/NSJAIL topic. Version 1.664.0 patches the issue.
Analysis
JavaScript code injection in Windmill's NativeTS executor allows workspace administrators to achieve remote code execution by embedding malicious payloads in environment variable values. The vulnerability (CWE-94) stems from improper sanitization of single quotes when interpolating workspace environment variables into JavaScript string literals, enabling arbitrary code execution in all NativeTS scripts within the affected workspace. …
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Remediation
Within 24 hours: Identify all Windmill instances and document current versions below 1.664.0; audit workspace administrator role membership and restrict to trusted personnel only. Within 7 days: Upgrade all affected Windmill deployments to version 1.664.0 or later; review audit logs for suspicious NativeTS script modifications or environment variable changes by admin accounts. …
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External POC / Exploit Code
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