CVE-2026-42220: nginx ui Information Disclosure

Description

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, an authenticated user can call GET /api/settings and retrieve sensitive configuration values, including node.secret. The same node.secret is accepted by AuthRequired() through the X-Node-Secret header (or node_secret query parameter), causing the request to be treated as authenticated via the trusted-node path and associated with the init user. This issue has been patched in version 2.3.8.

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CVSS v3.1 Score

6.5

MEDIUM

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

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
nginxui	nginx_ui	< 2.3.8

References

Advisories & Patches

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-7jrr-xw9c-mj39 https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-7jrr-xw9c-mj39

Exploits

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-7jrr-xw9c-mj39 https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-7jrr-xw9c-mj39

Other References

https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8

Frequently Asked Questions

What is CVE-2026-42220? +

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, an authenticated user can call GET /api/settings and retrieve sensitive configuration values, including node.secret. The same node.secret is accepted by AuthRequired() through the X-Node-Secret header (or node_secret query parameter), causing the request to be treated as authenticated via the trusted-node path and associated with the init user. This issue has been patched in version 2.3.8. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-42220? +

CVE-2026-42220 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42220? +

CVE-2026-42220 affects products from nginxui, specifically: nginx_ui. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42220? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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