What is CVE-2026-42238?

CVE-2026-42238 is a critical-severity vulnerability in 0xjacky Nginx-ui, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-04.

How severe is CVE-2026-42238?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in 0xjacky Nginx-ui

CVE-2026-42238

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any f…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (55.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

0xjacky Nginx-ui — versions < 2.3.8
Nginxui Nginx_ui

Weakness classification (CWE)

CWE-94 — Code Injection

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-4pvg-prr3-9cxr (x_refsource_CONFIRM, Exploit, Vendor Advisory)
https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8 (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-42238?: CVE-2026-42238 is a critical-severity vulnerability in 0xjacky Nginx-ui, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-04.
How severe is CVE-2026-42238?: Critical severity. CVSS v3 base score is 9.8 out of 10.