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

Source
https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/Nginx%20UI%20%E6%9C%AA%E6%8E%88%E6%9D%83%E5%A4%87%E4%BB%BD%E4%B8%8B%E8%BD%BD%E4%B8%8E%E5%8A%A0%E5%AF%86%E5%AF%86%E9%92%A5%E6%B3%84%E9%9C%B2%E6%BC%8F%E6%B4%9E%20CVE-2026-27944.md
Associated Vulnerability
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.
File Snapshot

 # Nginx UI 未授权备份下载与加密密钥泄露漏洞 CVE-2026-27944

## 漏洞描述

[Nginx UI](https://github.com/0xJacky/nginx-ui)

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