CVE-2026-27944
Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure
CRITICAL 9.8
At a glance
- Source
- NVD
- EPSS
- EPSS 22.94 % · percentile 98 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Analyzed
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.
Weaknesses (CWE)
- CWE-311 — Missing Encryption of Sensitive Data
- CWE-306 — Missing Authentication for Critical Functionality
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | GitHub_M |
| CVSS 3.1 | CRITICAL 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-g9w5-qffc-6762 — Nginx-UI Vulnerable to Unauthenticated Backup Download with Encryption Key Disclosure
- GO-2026-4614 — Nginx-UI Vulnerable to Unauthenticated Backup Download with Encryption Key Disclosure in github.com/0xJacky/Nginx-UI
European references
- ENISA EUVD · EUVD-2026-9847
- GCVE · GCVE-0-2026-27944
Affected configurations (NVD CPE)
cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*< 2.3.3
Affected products
| Product | Versions |
|---|---|
| 0xJacky · nginx-ui | affected < 2.3.3 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |