Summaryinfo

A vulnerability described as critical has been identified in windmill-labs windmill up to 1.663.x. The affected element is an unknown function of the component Environment Variable Handler. The manipulation results in code injection. This vulnerability is known as CVE-2026-33881. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in windmill-labs windmill up to 1.663.x. It has been classified as critical. Affected is an unknown code block of the component Environment Variable Handler. The manipulation with an unknown input leads to a code injection vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-33881 since 03/24/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation requires an enhanced level of successful authentication. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 1.664.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-16820). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• windmill-labs

Name

• windmill

Version

• 1.663

Website

• Product: https://github.com/windmill-labs/windmill/

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