0xJacky Nginx UI up to 2.4.2 Automatic Backup AutoBackup.GetName storage_path path traversal

Summaryinfo

A vulnerability marked as critical has been reported in 0xJacky Nginx UI up to 2.4.2. The affected element is the function AutoBackup.GetName of the component Automatic Backup. Performing a manipulation of the argument storage_path results in path traversal. This vulnerability is known as CVE-2026-84320. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in 0xJacky Nginx UI up to 2.4.2. This affects the function AutoBackup.GetName of the component Automatic Backup. The manipulation of the argument storage_path with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.3, Nginx UI validates an automatic backup's storage_path, but AutoBackup.GetName returns a user-controlled name without rejecting path separators or parent-directory components, and downstream filename formatting embeds that result in the final archive filename. An authenticated user who can create or modify an automatic backup can cause filepath.Join to resolve the generated archive path outside the validated storage directory, allowing backup archives to be written with the Nginx UI process privileges. For encrypted configuration backups, the adjacent encryption key file can also be written outside the validated directory. This issue is fixed in version 2.4.3.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-84320 since 09/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1006 for this issue.

Upgrading to version 2.4.3 eliminates this vulnerability.

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Productinfo

Type

• Web Server

Vendor

• 0xJacky

Name

• Nginx UI

Version

• 2.4.0
• 2.4.1
• 2.4.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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