CVE-2026-27944

CriticalCVSS 9.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-306 CWE-311

Affected software

Vendor	Product	Versions
0xJacky	nginx-ui	< 2.3.3

References

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-g9w5-qffc-6762Exploit, Vendor Advisory

Timeline

Published: Mar 5, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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