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Vulnerability record · CVE-2026-22683 · published 7 April 2026

CVE-2026-22683: Nextcloud flow missing authorization vulnerability

Nextcloud · Flow

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.

8.7 CVSS 4.0 High EPSS 2.6% · top 15.2% CWE-862 · Missing authorization
8.7CVSS 4.0 base score
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-22683), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.