Information disclosure in nginx-ui - CVE-2026-42220
Published: July 17, 2026
Vulnerability identifier: #VU138331
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42220
CWE-ID: CWE-200
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to exposure of sensitive information to an unauthorized actor in the GET /api/settings endpoint when handling authenticated settings requests. A remote user can request the settings API and obtain sensitive configuration values, including node.secret, to disclose sensitive information.
The disclosed node.secret is accepted through the X-Node-Secret header or node_secret query parameter by the trusted-node authentication path and can be used to access backup and restore functionality, including obtaining backup decryption material and rolling back nginx-ui state on installed instances.
Affected software
nginx-ui
How to mitigate CVE-2026-42220
Install security update from vendor's website.
nginx-ui - update to 2.3.8