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.
Nginx UI References: https://github.com/advisories/GHSA-g9w5-qffc-6762 https://www.tenable.com/security/research/tra-2026-17 https://vulnerabletarget.com/VT-2026-27944 Remediation: Upgrade to version 2.3.3 or later.
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