Information disclosure in 0xjacky Nginx-Ui
CVE-2026-42223
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.
Vulnerability class: Information Disclosure
EPSS: 0.003 (21.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
Affected products
- 0xjacky Nginx-ui — versions < 2.3.8
- Nginxui Nginx_ui
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-42223?
- CVE-2026-42223 is a medium-severity vulnerability in 0xjacky Nginx-Ui, classified under Information Disclosure. CVSS score: 6.5/10. Published 2026-05-04.
- How severe is CVE-2026-42223?
- Medium severity. CVSS v3 base score is 6.5 out of 10.