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TI-2026-26239 Aliases CVE-2026-33881

Code injection in windmill

Priority HIGH 67CWE-94Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-94.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00393 33rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed windmill (windmill-labs): 1.664.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Windmill Labswindmillbefore 1.664.01.664.0Patch availableCNA
  • windmill VendorWindmill Labs Affected before 1.664.0 Fixed in 1.664.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:windmill:windmill:*:*:*:*:*:*:*:*before 1.664.0VulnerableWindmill Labs
  • cpe:2.3:a:windmill:windmill:*:*:*:*:*:*:*:* Versions before 1.664.0 Vulnerable ·Windmill Labs

Remediation

  • Fix · CNA windmill (windmill-labs) Fixed in 1.664.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33881

References

Exploit 1

  • TI-2026-18211 Windmill < 1.615.0 Operator Role Missing Authorization Checks RCE CVSS 4.0HIGH 8.7
  • TI-2026-23204 Windmill: SUPERADMIN_SECRET (rarely used) can be accessed publicly CVSS 4.0MEDIUM 6.9
  • TI-2026-21449 Windmill Exposes Workspace Slack OAuth Client Secrets to Non-Admin Workspace Members CVSS 3.1LOW 2.7

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences