# CVE-2026-33881: Code injection in windmill

> Workspace admins can inject arbitrary JavaScript into NativeTS scripts via unescaped environment variables, leading to code execution.

- **Severity:** High 7.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Mar 2026
- **Updated:** 1 Apr 2026
- **Also known as:** GHSA-8q8j-mm3g-5c2q

## What is CVE-2026-33881?

CVE-2026-33881 is a high-severity code injection vulnerability in windmill-labs windmill, published on 27 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official 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.

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-33881?

It affects 1 product.


Products: Windmill Windmill.

## How do I fix CVE-2026-33881?

No fix has been published for CVE-2026-33881 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-33881 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33881 exists.

## Other vulnerabilities in windmill-labs windmill

- [CVE-2026-29059](https://insights.sbomify.com/CVE-2026-29059/): Windmill: SUPERADMIN_SECRET (rarely used) can be accessed publicly (medium 6.9)
- [CVE-2026-26964](https://insights.sbomify.com/CVE-2026-26964/): Windmill Exposes Workspace Slack OAuth Client Secrets to Non-Admin Workspace Members (low 2.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-33881 and fix it if it is affected.

What it is: CVE-2026-33881 is a high-severity code injection vulnerability in windmill-labs windmill, published on 27 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33881 exists.

Affected product: windmill-labs windmill. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-33881/ (Markdown: https://insights.sbomify.com/CVE-2026-33881/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-33881
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-33881
- OSV: https://osv.dev/vulnerability/CVE-2026-33881

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-33881/
Summaries are generated and may contain mistakes; the official description above is the record.