Vulnerability Details CVE-2026-27944
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 13.7%
CVSS Severity
CVSS v3 Score 9.8