CVE-2026-84317 Nginx UI - Command Injection

Nginx UI < 2.4.1 contains a command injection caused by lack of validation in MCP tool nginx_config_add allowing authenticated MCP callers to inject dangerous directives, letting attackers execute code via njs/perl modules.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Command Injection
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
12 October 2026
Updated
15 October 2026
Weakness
CWE-20

Vendor fix

Update to version 2.4.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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