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CVE-2026-33881

Windmill code injection

7.2 HIGHPublic exploitEPSS 0.57%
  1. Published27 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

Windmill< 1.664.0

Remediation

Fixed in
Windmill≥ 1.664.0

References

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Frequently asked

Is CVE-2026-33881 being actively exploited?

CVE-2026-33881 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-33881?

CVE-2026-33881 has a CVSS 3.1 base score of 7.2, rated high. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-33881?

Affected products include Windmill.

How do I fix CVE-2026-33881?

Upgrade affected software to a fixed version, for example Windmill 1.664.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33881 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.