CVE-2026-27944

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 1.01%
EPSS Percentile: 62.24%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: security-advisories@github.com
Published: 06-Mar-2026 02:16
Last Modified: 17-Jun-2026 17:27
EPSS Date: 2026-10-11
CWE: CWE-306, CWE-311

CVSS Vector


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

Affected Products / Versions

nginxui / nginx_ui
Version / affected range: * · before (exclusive) 2.3.3
cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*

References

security-advisories@github.com

Last enrichment sync: 12-Oct-2026 09:33
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

Nginx UI's unauthenticated backup disclosure, CVE-2026-27944, and unauthenticated MCP endpoint, CVE-2026-33032, match the debug build's backup and MCP-chain artifacts. N4D Linux Malware Abuses MCP Tools and Scans for Exposed Services

CVE (4)

Malware (2)

People (1)

MITRE ATT&CK (11)

Products (22)

Tools (7)

Industries (1)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.