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CVE-2026-42238— Unauthenticated Remote Code Execution via Backup Restore in nginx-ui

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 2.3.8之前版本存在代码注入漏洞，该漏洞源于备份恢复端点POST /api/restore在进程启动后前10分钟内完全未经身份验证，可能导致未经身份验证的远程攻击者上传特制备份存档覆盖配置文件app.ini和SQLite数据库，注入任意OS命令至TestConfigCmd设置，并在应用自动重启后触发命令执行。

AI Predicted 9.8 Difficulty: Easy EPSS 0.83% · P56

Affected Version Matrix 1

VendorProduct Version RangeStatus
0xJacky nginx-ui < 2.3.8 affected
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I. Basic Information for CVE-2026-42238

Vulnerability Information
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Vulnerability Title
Unauthenticated Remote Code Execution via Backup Restore in nginx-ui
Source: CVE Program / CVE List V5
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.8, nginx-ui exposes a backup restore endpoint (POST /api/restore) that is completely unauthenticated during the first 10 minutes after process startup on any fresh installation. An unauthenticated remote attacker can upload a crafted backup archive that overwrites the application's configuration file (app.ini) and SQLite database. Because the attacker controls the restored app.ini, they can inject an arbitrary OS command into the TestConfigCmd setting. After the application automatically restarts to apply the restored config, a single follow-up request triggers that command as the user running nginx-ui — typically root in Docker deployments. This issue has been patched in version 2.3.8.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Nginx UI 代码注入漏洞
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 2.3.8之前版本存在代码注入漏洞，该漏洞源于备份恢复端点POST /api/restore在进程启动后前10分钟内完全未经身份验证，可能导致未经身份验证的远程攻击者上传特制备份存档覆盖配置文件app.ini和SQLite数据库，注入任意OS命令至TestConfigCmd设置，并在应用自动重启后触发命令执行。
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 < 2.3.8 -

II. Public POCs for CVE-2026-42238

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III. Intelligence Information for CVE-2026-42238

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Vendor Advisories for CVE-2026-42238 (1)

Other References for CVE-2026-42238 (1)

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

CVE-2026-42222 8.1 HIGH nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bo
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

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-94

V. Comments for CVE-2026-42238

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