CVE-2026-27944 — Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
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 key…
Published: 2026-03-05 · CVSS: 9.8 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7