CVE-2026-27944
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-311 CWE-306 |
| Vendor | 0xjacky |
| Product | nginx-ui |
| Published | Mar 5, 2026 |
| Last Updated | Mar 19, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
0xJacky / nginx-ui
< 2.3.3