CVE-2026-22683Public exploitNetwork attack vector

Operator-to-code-execution escalation via unchecked workspace writes

Published Apr 7, 2026 · Updated Apr 7, 2026

Missing authorization in Windmill 1.56.0 through 1.614.0 and Nextcloud Flow 1.0.0 through 1.3.1 allows remote authenticated users to execute code. Workspace API handlers for script, flow, app, and raw-app creation and update accept an Operator-authenticated request without rejecting the restricted role. An Operator account and network access to the backend API are required; created scripts can then run through the jobs API with the deployment's worker privileges.

CVSS severity8.7
High
EPSS probability2.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Windmill 1.56.0 through 1.614.0 and Nextcloud Flow 1.0.0 through 1.3.1 allows remote authenticated users to execute code. Workspace API handlers for script, flow, app, and raw-app creation and update accept an Operator-authenticated request without rejecting the restricted role. An Operator account and network access to the backend API are required; created scripts can then run through the jobs API with the deployment's worker privileges.

The record

CVE
CVE-2026-22683
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Nextcloud GmbH
Product
Flow
Classifications
CWE-862, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=1.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Flowversion=1.0.0 <=1.3.1
Windmill Labs · Windmill Community Editionversion=1.56.0 <=1.614.0
Windmill Labs · Windmill Enterprise Editionversion=1.56.0 <=1.614.0

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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