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Vulnerability · Published Oct 12, 2026 · Assigned by GitHub_M

CVE-2026-84320Nginx UI: Auto backup name allows path traversal outside validated storage path

Medium 6.3

In plain English

A medium-severity path traversal in nginx-ui from 0xJacky. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.3Medium
Exploit odds (30 days)0.2%top 93.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/0xJacky/Nginx-UI1.9.10-0.20260715121709-f92218e01054GHSA-jrq7-xrjx-pcfw
Gogithub.com/0xJacky/Nginx-UI1.9.10-0.20260715121709-f92218e01054GO-2026-6788

Affected products (as reported)

VendorProductVersions
0xJacky nginx-ui < 2.4.3

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References