TI-2026-22288 Aliases CVE-2026-27944 GHSA-g9w5-qffc-6762

Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure

HIGH 82CWE-306Published 2026-03-05 · Updated 2026-03-19

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass, Information disclosure
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306 and CWE-311.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.22842 97th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed nginx-ui (0xJacky): 2.3.3github.com/0xJacky/Nginx-UI (Go): 2.3.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
0xJacky	nginx-ui	before 2.3.3	2.3.3	Patch available	CNA
—	github.com/0xJacky/Nginx-UI (Go)	before 2.3.3	2.3.3	Patch available	GHSA-g9w5-qffc-6762

nginx-ui Vendor0xJacky Affected before 2.3.3 Fixed in 2.3.3 Patch available CNA
github.com/0xJacky/Nginx-UI (Go) Vendor— Affected before 2.3.3 Fixed in 2.3.3 Patch available GHSA-g9w5-qffc-6762

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nginxui:nginx_ui::::::::	before 2.3.3	Vulnerable	0xJacky

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:* Versions before 2.3.3 Vulnerable ·0xJacky

Remediation

Fix · CNA nginx-ui (0xJacky) Fixed in 2.3.3
Fix · GHSA-g9w5-qffc-6762 github.com/0xJacky/Nginx-UI (Go) Fixed in 2.3.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-27944
2026-10-03 Alias added: GHSA-g9w5-qffc-6762
2026-10-25 EPSS moved to the 95th–99th percentile

References

Exploit 1

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

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-27944

Other 4

TI-2026-25478 Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover CVSS 3.1CRITICAL 9.8
TI-2026-25472 nginx-ui Backup Restore Allows Tampering with Encrypted Backups CVSS 4.0CRITICAL 9.4
TI-2024-15821 Nginx-UI arbitrary file write through the Import Certificate feature CVSS 3.1CRITICAL 9.8
TI-2026-70057 Code injection in Nginx UI backup restore allows code execution CVSS 4.0CRITICAL 9.4
TI-2026-32056 Nginx UI: Server-Side Request Forgery (SSRF) via Cluster Proxy Middleware Allows Access to Internal Services CVSS 3.1CRITICAL 9.9
TI-2026-30543 nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover CVSS 3.1CRITICAL 9.8

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences