Synopsis
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.
Solution
Upgrade to Nginx UI version 2.3.3 or later.
Additional References
https://github.com/0xJacky/nginx-uihttps://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762
Disclosure Timeline
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