CVE-2026-42222

Name: CVE-2026-42222
Creator: NVD / NIST
Published: 2026-05-04T21:16:32.173+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-42222 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.34%

25.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nginxui	Nginx Ui	2.3.5

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pqExploit, Vendor Advisory
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pqExploit, Vendor Advisory

Timeline

Published: May 4, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42222?

How severe is CVE-2026-42222?

CVE-2026-42222 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42222?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42222?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST