CVE-2026-22683
HighPublic exploitWindmill 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.
Published Apr 7, 2026 · Updated Sep 5, 2026 · Also known as EUVD-2026-19747, GHSA-9q9g-rp9x-244h
Key Facts
Patch immediately- CVE-2026-22683 is a high-severity vulnerability (CVSS 8.7 v4) affecting Flow (Nextcloud), Windmill, Windmill CE (Community Edition) and 1 more product.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 2.6% probability of exploitation in the next 30 days.
- Fixed versions are available, including Flow 1.2.2, Windmill 1.614.0.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
CVSS v4
8.7
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:X/V:X/RE:X/U:X
EPSS (30-day exploit likelihood)
2.6%
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2026-22683 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Affected Products
8 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FlowNextcloud | See advisory | 1.2.2 |
| WindmillWindmill | See advisory | 1.614.0 |
| Windmill CE (Community Edition) | >= 1.56.0 | n/a |
| Windmill EE (Enterprise Edition) | >= 1.56.0 | n/a |
Patched Releases
Flow
1.2.2
Windmill
1.614.0
Timeline
Publicly disclosed
Apr 7, 2026
Last updated
Sep 5, 2026
Weakness Type
- CWE-862 Missing Authorization
References
- advisoryhttps://apps.nextcloud.com/apps/flow/releases
- advisoryhttps://chocapikk.com/posts/2026/windfall-nextcloud-flow-windmill-rce/
- advisoryhttps://github.com/Chocapikk/Windfall
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22683.json
- advisoryhttps://github.com/windmill-labs/windmill/commit/c621a74804f4f6e8318819c01e3a23a17698588b
FAQ
Common Questions.
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.
Affected: Flow (Nextcloud); Windmill; Windmill CE (Community Edition) versions >= 1.56.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Flow 1.2.2, Windmill 1.614.0.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2026-22683 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo