CVE-2026-27944 PoC — Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure

Title:Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure (CVE-2026-27944)
Description: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 < 2.3.3 contains an information disclosure vulnerability caused by unauthenticated access to /api/backup endpoint exposing encryption keys in X-Backup-Security header, letting unauthenticated attackers download and decrypt full system backups.

 id: CVE-2026-27944

info:
  name: Nginx UI < 2.3.3 - Information Disclosure
  author: omarkurt
  sev

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