CVE-2026-33881: Windmill is an open-source developer platform for internal code: APIs, background jobs, workflows and UIs

Q: How do I fix CVE-2026-33881?

windmill: upgrade to 1.664.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33881 being exploited?

CVE-2026-33881 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33881 affect?

CVE-2026-33881 affects windmill. Severity is high (CVSS 7.2). 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

Q: How urgent is CVE-2026-33881?

Priority 39/100. High severity; Public exploit reference

Routine

HIGH 7.2UPGRADE

CVE-2026-33881 is a high-severity flaw (CVSS 7.2) affecting windmill. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 injec

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-94
Published	2026-03-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: windmill

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 21:17 UTCPublished CVE record published
2026-06-17 10:38 UTCUpdated Record last modified

windmill windmill UPGRADE

Affected: < 1.664.0

Fixed in: 1.664.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy windmill || rpm -q windmill || windmill --version

2. UPGRADE to 1.664.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade windmill

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade windmill

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33881?

windmill: upgrade to 1.664.0. Exact commands for each OS are on this page.

Is CVE-2026-33881 being exploited?

CVE-2026-33881 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33881 affect?

CVE-2026-33881 affects windmill. Severity is high (CVSS 7.2). 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

How urgent is CVE-2026-33881?

Priority 39/100. High severity; Public exploit reference

Related CVEs

CVE-2026-22683 HIGH 8.8 UPGRADE UPGRADE Windmill versions 1.56.0 through 1.614.0 contain a missing authorization vulnerability that allows users with

References

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