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TI-2026-30543 Aliases CVE-2026-42222GHSA-mxqh-q9h6-v8pq

nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover

Priority HIGH 76CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00339 27th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
0xJackynginx-ui= 2.3.5—No fix listedCNA
—github.com/0xJacky/nginx-ui (Go)——No fix listedGHSA-mxqh-q9h6-v8pq
  • nginx-ui Vendor0xJacky Affected = 2.3.5 Fixed in — No fix listed CNA
  • github.com/0xJacky/nginx-ui (Go) Vendor— Affected — Fixed in — No fix listed GHSA-mxqh-q9h6-v8pq

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nginxui:nginx_ui:2.3.5:*:*:*:*:*:*:*2.3.5Vulnerable0xJacky
  • cpe:2.3:a:nginxui:nginx_ui:2.3.5:*:*:*:*:*:*:* Versions 2.3.5 Vulnerable ·0xJacky

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42222
  2. 2026-10-03 Alias added: GHSA-mxqh-q9h6-v8pq

References

Exploit 1

Advisory 1

Other 1

  • 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-2026-22288 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure CVSS 3.1CRITICAL 9.8
  • 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
See all 31 →

Sources

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