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CVE-2026-84316— Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line ";" separation → authenticated directive injection (RCE on the official image)

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 Nginx 网络服务器的 Web 用户界面。在 2.4.1 版本之前，config.ValidateConfigDirectives 函数按换行符分割配置文件，并仅检查每行的第一个指令令牌。然而，Nginx 实际上允许在一行中使用多个用分号分隔的指令。认证用户可以在同一行的前面放置一个合法的指令，而在该行后面插入受限的 load_module、js_import、perl 或 user root 指令；或者可以利用未受限制的 include 指令来加载受限内容。这些机制绕过了对 REST、ng

CVSS 8.8 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
0xJacky nginx-ui < 2.4.1 affected
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I. Basic Information for CVE-2026-84316

Vulnerability Information
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Vulnerability Title
Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line ";" separation → authenticated directive injection (RCE on the official image)
Source: CVE Program / CVE List V5
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, config.ValidateConfigDirectives splits configuration by newline and checks only the first directive token on each line even though Nginx permits multiple semicolon-separated directives on one line. An authenticated caller can place a benign directive first and a restricted load_module, js_import, perl, or user root directive later on the same line, or can use an unrestricted include directive to load restricted content. These mechanisms bypass validation on REST, nginx_config_modify, site, and stream write paths; when an executable module is available, the injected configuration can execute code in the Nginx worker context. This issue is fixed in version 2.4.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
0xJacky nginx-ui < 2.4.1 -

II. Public POCs for CVE-2026-84316

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III. Intelligence Information for CVE-2026-84316

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Vendor Advisories for CVE-2026-84316 (1)

Same Patch Batch · 0xJacky · 2026-10-12 · 11 CVEs total

CVE-2026-84318 8.8 HIGH Nginx UI: MCP `nginx_config_add` Bypasses Directive Validation — Authenticated RCE
CVE-2026-84313 8.8 HIGH Nginx UI: TOTP / passkey enrolment requires no re-authentication, enabling persistent acco
CVE-2026-84317 8.8 HIGH Nginx UI: MCP nginx_config_add skips config directive validation → authenticated nginx dir
CVE-2026-84314 8.7 HIGH Nginx UI: Account Takeover via Missing `RequireSecureSession` on User Management Endpoint
CVE-2026-84315 8.3 HIGH Nginx UI OTP secure-session step-up is missing on sensitive mutation routes
CVE-2026-84319 8.3 HIGH Nginx UI: MCP configuration tools bypass restricted directive validation and allow seconda
CVE-2026-84360 8.1 HIGH Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools
CVE-2026-84312 7.1 HIGH Nginx UI: Casdoor SSO callback uses a constant `state` parameter (login CSRF)
CVE-2026-84320 6.3 MEDIUM Nginx UI: Auto backup name allows path traversal outside validated storage path
CVE-2026-84321 5.4 MEDIUM Nginx UI: Standalone short tokens survive administrative revocation in cache and authentic

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-20

V. Comments for CVE-2026-84316

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