CVE-2026-27944
CRITICAL 9.8EPSS 22.2%
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.
- CVSS v3.1
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v3.1
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 22.16% chance of exploitation in the next 30 days, 98th percentile
- Nuclei
- critical · CWE-306
- Published
- 2026-03-05
- Updated
- 2026-03-19
Proof-of-concept exploits (6)
- advisories/GHSA-g9w5-qffc-6762
- Skynoxk/CVE-2026-279449★ · 2026-03-14
- NULL200OK/CVE-2026-279444★ · 2026-03-10
- Goultarde/CVE-2026-27944-poc0★ · 2026-04-02
- jake-young-dev/CVE-2026-279441★ · 2026-05-06
- BimaBalance/Cve-2026-27944-Tools-Exploit