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CVE-2026-42222— nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover

Quick assessment

Affected
0xJacky nginx-ui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.5版本存在访问控制错误漏洞，该漏洞源于初始安装窗口期间POST /api/install端点存在未认证引导接管。

CVSS 8.1 · High EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
0xJacky nginx-ui = 2.3.5 affected
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I. Basic Information for CVE-2026-42222

Vulnerability Information
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Vulnerability Title
nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Nginx UI 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.5版本存在访问控制错误漏洞，该漏洞源于初始安装窗口期间POST /api/install端点存在未认证引导接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
0xJacky nginx-ui = 2.3.5 -

II. Public POCs for CVE-2026-42222

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III. Intelligence Information for CVE-2026-42222

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Vendor Advisories for CVE-2026-42222 (1)

Same Patch Batch · 0xJacky · 2026-05-04 · 5 CVEs total

CVE-2026-42221 8.1 HIGH nginx-ui: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim
CVE-2026-42220 6.5 MEDIUM nginx-ui: Authenticated settings disclosure exposes node.secret and enables trusted-node a
CVE-2026-42223 6.5 MEDIUM nginx-ui: Settings API Exposes Protected Secrets
CVE-2026-42238 Unauthenticated Remote Code Execution via Backup Restore in nginx-ui

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-306

V. Comments for CVE-2026-42222

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