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CVE-2026-33881— Windmill: Rogue Workspace Admins can inject code via unescaped workspace environment variable interpolation in NativeTS executor

Quick assessment

Affected
windmill-labs windmill
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WindMill是Lukasavicus个人开发者的一个免费的开源工具。用于控制 Python 中的作业执行。 WindMill 1.664.0之前版本存在代码注入漏洞，该漏洞源于工作区环境变量值在未转义单引号的情况下插入JavaScript字符串字面量，可能导致工作区管理员注入任意JavaScript代码。

AI Predicted 8.6 Difficulty: Easy EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33881

Vulnerability Information
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Vulnerability Title
Windmill: Rogue Workspace Admins can inject code via unescaped workspace environment variable interpolation in NativeTS executor
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
WindMill 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WindMill是Lukasavicus个人开发者的一个免费的开源工具。用于控制 Python 中的作业执行。 WindMill 1.664.0之前版本存在代码注入漏洞，该漏洞源于工作区环境变量值在未转义单引号的情况下插入JavaScript字符串字面量，可能导致工作区管理员注入任意JavaScript代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
windmill-labs windmill < 1.664.0 -

II. Public POCs for CVE-2026-33881

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III. Intelligence Information for CVE-2026-33881

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Vendor Advisories for CVE-2026-33881 (1)

IV. Related Vulnerabilities

Same product: windmill
Same vendor: windmill-labs
Same weakness: CWE-94

V. Comments for CVE-2026-33881

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