What is CVE-2026-42222?

CVE-2026-42222 is a high-severity vulnerability in 0xjacky Nginx-ui, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-05-04.

How severe is CVE-2026-42222?

High severity. CVSS v3 base score is 8.1 out of 10.

Auth bypass in 0xjacky Nginx-ui

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 pat…

EPSS: 0.001 (17.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

0xjacky Nginx-ui — versions = 2.3.5
Nginxui Nginx_ui — versions 2.3.5

Weakness classification (CWE)

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42222?: CVE-2026-42222 is a high-severity vulnerability in 0xjacky Nginx-ui, classified under Improper Access Control. CVSS score: 8.1/10. Published 2026-05-04.
How severe is CVE-2026-42222?: High severity. CVSS v3 base score is 8.1 out of 10.