CVE-2026-27944: Nginxui Nginx UI

Critical severity, CVSS 9.8. EPSS: 1% chance of exploitation in the next 30 days.

Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.3, the /api/backup endpoint is accessible without authentication and discloses the encryption keys required to decrypt the backup in the X-Backup-Security response header. This allows an unauthenticated attacker to download a full system backup containing sensitive data (user credentials, session tokens, SSL private keys, Nginx configurations) and decrypt it immediately. This issue has been patched in version 2.3.3.

Affected products

• Nginxui Nginx UI: before 2.3.3 (fixed in 2.3.3)

Published 2026-03-05. Last modified 2026-06-17.