Windmill versions 1.56.0 through 1.614.0 contain a missing authorization vulnerability that allows users with the Operator role to perform prohibited entity creation and modification actions via the backend API. Although Operators are documented and priced as unable to create or modify entities, the API does not enforce the Operator restriction on workspace endpoints, allowing an Operator to create and update scripts, flows, apps, and raw_apps. Since Operators can also execute scripts via the jobs API, this allows direct privilege escalation to remote code execution within the Windmill deployment. This vulnerability has existed since the introduction of the Operator role in version 1.56.0.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://chocapikk.com/posts/2026/windfall-nextcloud-flow-windmill-rce/ Vendor Advisory
- https://github.com/windmill-labs/windmill/commit/c621a74804f4f6e8318819c01e3a23a17698588b Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.7 · nextcloud, windmillNVD modified 2026-10-26 21:10
Affected (CPE criteria) 2
cpe:2.3:a:nextcloud:flow:*:*:*:*:*:*:*:*cpe:2.3:a:windmill:windmill:*:*:*:*:*:*:*:*
References 6
- https://apps.nextcloud.com/apps/flow/releases Release Notes
- https://chocapikk.com/posts/2026/windfall-nextcloud-flow-windmill-rce/ Vendor Advisory
- https://github.com/Chocapikk/Windfall Product
- https://github.com/windmill-labs/windmill/commit/c621a74804f4f6e8318819c01e3a23a17698588b Patch
- https://github.com/windmill-labs/windmill/releases/tag/v1.615.0 Release Notes
- https://www.windmill.dev/ Product