Input validation error in nginx-ui - #VU138335
Published: July 17, 2026
Vulnerability identifier: #VU138335
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to improper input validation in config.ValidateConfigFile when processing nginx configuration content. A remote user can place a benign directive before a semicolon-separated restricted directive on the same line to execute arbitrary code.
Exploitation requires authentication such as a node secret or user JWT. On deployments without the required modules, the issue can cause a failed reload instead of code execution.
Affected software
nginx-ui
Remediation
Install security update from vendor's website.
nginx-ui - update to 2.4.0