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CVE-2026-33027— Nginx UI: Improper Path Validation Allows Recursive Deletion of the Nginx Configuration Directory

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 2.3.4之前版本存在安全漏洞，该漏洞源于配置不当处理URL编码的遍历序列，可能导致经过身份验证的用户删除整个/etc/nginx目录，造成部分拒绝服务。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.55% · P44
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I. Basic Information for CVE-2026-33027

Vulnerability Information
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Vulnerability Title
Nginx UI: Improper Path Validation Allows Recursive Deletion of the Nginx Configuration Directory
Source: CVE Program / CVE List V5
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. Prior to version 2.3.4, the nginx-ui configuration improperly handles URL-encoded traversal sequences. When specially crafted paths are supplied, the backend resolves them to the base Nginx configuration directory and executes the operation on the base directory (/etc/nginx). In particular, this allows an authenticated user to remove the entire /etc/nginx directory, resulting in a partial Denial of Service. This issue has been patched in version 2.3.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Nginx UI 安全漏洞
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 2.3.4之前版本存在安全漏洞，该漏洞源于配置不当处理URL编码的遍历序列，可能导致经过身份验证的用户删除整个/etc/nginx目录，造成部分拒绝服务。
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 < 2.3.4 -

II. Public POCs for CVE-2026-33027

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III. Intelligence Information for CVE-2026-33027

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Vendor Advisories for CVE-2026-33027 (1)

Vendor Pages for CVE-2026-33027 (1)

Same Patch Batch · 0xJacky · 2026-03-30 · 6 CVEs total

CVE-2026-33032 9.8 CRITICAL Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
CVE-2026-33030 8.8 HIGH Nginx UI: Unencrypted Storage of DNS API Tokens and ACME Private Keys
CVE-2026-33028 Nginx UI: Race Condition Leads to Persistent Data Corruption and Service Collapse
CVE-2026-33029 Nginx UI: DoS via Negative Integer Input in Logrotate Interval
CVE-2026-33026 nginx-ui Backup Restore Allows Tampering with Encrypted Backups

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-22

V. Comments for CVE-2026-33027

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