How severe is CVE-2026-42222?

CVE-2026-42222 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-42222 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42222?

CVE-2026-42222 affects Nginxui Nginx Ui. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42222?

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-2026-42222 have an EU (EUVD) identifier?

Yes. CVE-2026-42222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27137.

When was CVE-2026-42222 published?

CVE-2026-42222 was published on 2026-05-04 and last updated on 2026-06-17.

CVE-2026-42222

CVE-2026-42222 is a high-severity vulnerability in Nginxui Nginx Ui with a CVSS 3.x base score of 8.1. 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-284.

Key facts

Severity: High (CVSS 3.x base score 8.1)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27137
Weakness: CWE-284
Affected product: Nginxui Nginx Ui
Published: 2026-05-04
Last modified: 2026-06-17

Description

Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.

Frequently asked questions

What is CVE-2026-42222?: Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.
How severe is CVE-2026-42222?: CVE-2026-42222 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-42222 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42222?: CVE-2026-42222 affects Nginxui Nginx Ui. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42222?: 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-2026-42222 have an EU (EUVD) identifier?: Yes. CVE-2026-42222 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27137.
When was CVE-2026-42222 published?: CVE-2026-42222 was published on 2026-05-04 and last updated on 2026-06-17.

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq

Affected products (1)

cpe:2.3:a:nginxui:nginx_ui:2.3.5:*:*:*:*:*:*:*

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