How severe is CVE-2026-22683?

CVE-2026-22683 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22683 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22683?

CVE-2026-22683 primarily affects Nextcloud Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-22683?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-22683 have an EU (EUVD) identifier?

Yes. CVE-2026-22683 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19747.

When was CVE-2026-22683 published?

CVE-2026-22683 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-22683

CVE-2026-22683 is a high-severity vulnerability in Nextcloud Flow with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v4: 8.7
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19747
Weakness: CWE-862
Affected product: Nextcloud Flow
Published: 2026-04-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-22683?: 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.
How severe is CVE-2026-22683?: CVE-2026-22683 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22683 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22683?: CVE-2026-22683 primarily affects Nextcloud Flow. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-22683?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-22683 have an EU (EUVD) identifier?: Yes. CVE-2026-22683 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19747.
When was CVE-2026-22683 published?: CVE-2026-22683 was published on 2026-04-07 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:nextcloud:flow:*:*:*:*:*:*:*:*
cpe:2.3:a:windmill:windmill:*:*:*:*:*:*:*:*

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