Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fresh installation. An unauthenticated remote attacker can upload a crafted backup archive that overwrites the application's configuration file (app.ini) and SQLite database. Because the attacker controls the restored app.ini, they can inject an arbitrary OS command into the TestConfigCmd setting. After the application automatically restarts to apply the restored config, a single follow-up request triggers that command as the user running nginx-ui — typically root in Docker deployments. This issue has been patched in version 2.3.8.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nginxui | Nginx Ui | < 2.3.8 |
Related Weaknesses (CWE)
References
- https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8Release Notes
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-4pvg-prr3-9cxrExploitVendor Advisory
- https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-4pvg-prr3-9cxrExploitVendor Advisory
FAQ
What is CVE-2026-42238?
CVE-2026-42238 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10...
How severe is CVE-2026-42238?
CVE-2026-42238 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-42238?
Check the references section above for vendor advisories and patch information. Affected products include: Nginxui Nginx Ui.