CVE-2026-42223

Name: CVE-2026-42223
Creator: NVD / NIST
Published: 2026-05-04T21:16:32.32+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-42223 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, the GetSettings API handler (api/settings/settings.go:24-65) serializes all settings structs to JSON and returns them to authenticated users. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, the GetSettings API handler (api/settings/settings.go:24-65) serializes all settings structs to JSON and returns them to authenticated users. Many sensitive fields are tagged with protected:"true" - however, this tag is only enforced during writes (via ProtectedFill in SaveSettings) and is completely ignored during reads. This exposes 40+ protected fields including JwtSecret (enabling auth token forgery), NodeSecret (enabling cluster node impersonation), OIDC ClientSecret (enabling OAuth account takeover), and the IP whitelist configuration. This issue has been patched in version 2.3.8.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.29%

21.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Nginxui	Nginx Ui	< 2.3.8

References

https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8Release Notes
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-q4w7-56hr-83rmExploit, Vendor Advisory
https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-q4w7-56hr-83rmExploit, Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2026-42223?

How severe is CVE-2026-42223?

CVE-2026-42223 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42223?

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-2026-42223?

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

Scan your code now

Source: NVD / NIST