0xJacky Nginx UI up to 2.4.0 Config Validation config.ValidateConfigDirectives input validation

Summaryinfo

A vulnerability has been found in 0xJacky Nginx UI up to 2.4.0 and classified as critical. This issue affects the function config.ValidateConfigDirectives of the component Config Validation. The manipulation leads to input validation. This vulnerability is referenced as CVE-2026-84316. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in 0xJacky Nginx UI up to 2.4.0 and classified as critical. This issue affects the function config.ValidateConfigDirectives of the component Config Validation. The manipulation with an unknown input leads to a input validation vulnerability. Using CWE to declare the problem leads to CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, config.ValidateConfigDirectives splits configuration by newline and checks only the first directive token on each line even though Nginx permits multiple semicolon-separated directives on one line. An authenticated caller can place a benign directive first and a restricted load_module, js_import, perl, or user root directive later on the same line, or can use an unrestricted include directive to load restricted content. These mechanisms bypass validation on REST, nginx_config_modify, site, and stream write paths; when an executable module is available, the injected configuration can execute code in the Nginx worker context. This issue is fixed in version 2.4.1.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-84316 since 09/01/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details are known, but no exploit is available.

Upgrading to version 2.4.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-97906). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Web Server

Vendor

• 0xJacky

Name

• Nginx UI

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4.0

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion