Nginx UI: Auto backup name allows path traversal outside validated storage path

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS

• CVE-2026-84320: 0.17% estimated exploitation activity in the next 30 days; percentile 6.03 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Nginx UI validates backuppath and storagepath against the administrator-defined backup.GrantedAccessPath boundary, but the final auto-backup output filename is built from the user-controlled auto-backup name without stripping path separators or .. components. An authenticated user who can create or modify an auto-backup task can set a name such as task/../../../escaped. The configured storagepath still passes validation because it is inside GrantedAccessPath, but the generated backup path escapes that storage directory when filepath.Join(storagepath, filename) resolves the embedded traversal sequence. This bypasses the documented backup path boundary and allows backup archives, and for encrypted configuration backups the adjacent .key file, to be written outside the intended storage directory with the Nginx UI process privileges. Affected Versions - Current dev branch commit checked: 4948fba8744e82c3d7003f68ee164e9f49421066 - Latest release checked: v2.3.10, published…

Published by the source

15 Oct 2026, 20:10 UTC

Last modified by the source

19 Oct 2026, 21:31 UTC

Source last checked

26 Oct 2026, 15:32 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-jrq7-xrjx-pcfw

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6788

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-jrq7-xrjx-pcfw

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# Patch Next advisory brief: CVE-2026-84320

Advisory: Nginx UI: Auto backup name allows path traversal outside validated storage path
IDs: CVE-2026-84320, GHSA-jrq7-xrjx-pcfw
Record: https://patchnext.com/advisories/cve-2026-84320 (revision 3, source checked 26 Oct 2026, 15:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/0xJacky/Nginx-UI 1.9.10-0.20260715121709-f92218e01054. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/0xJacky/Nginx-UI: affected < 1.9.10-0.20260715121709-f92218e01054; fixed in 1.9.10-0.20260715121709-f92218e01054

## Suggested inspection (read-only)
- Go github.com/0xJacky/Nginx-UI: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/0xJacky/Nginx-UI.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GO-2026-6788 (OSV record GO-2026-6788 lists affected ranges: Go github.com/0xJacky/Nginx-UI >=0 <1.9.10-0.20260715121709-f92218e01054 (fixed))
- Verified: https://osv.dev/vulnerability/GHSA-jrq7-xrjx-pcfw (OSV record GHSA-jrq7-xrjx-pcfw lists affected ranges: Go github.com/0xJacky/Nginx-UI >=0 <1.9.10-0.20260715121709-f92218e01054 (fixed))
- Verified: https://github.com/advisories/GHSA-jrq7-xrjx-pcfw (GitHub-reviewed advisory GHSA-jrq7-xrjx-pcfw lists affected ranges: Go github.com/0xJacky/Nginx-UI >=0 <1.9.10-0.20260715121709-f92218e01054)

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