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CVE-2026-84312— Nginx UI: Casdoor SSO callback uses a constant `state` parameter (login CSRF)

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 Web 服务器的 Web 用户界面。在 2.4.1 版本之前，GetCasdoorUri 使用配置的 Casdoor 应用程序名称作为固定的 OAuth state 值，而 CasdoorCallback 不会将提交的 state 值与初始浏览器会话绑定的值进行比较。未认证的攻击者可以诱导受害者的浏览器完成由攻击者控制的 Casdoor 授权流程，该回调可以使用该授权码返回的身份信息生成一个 Nginx UI 会话。此问题已在 2.4.1 版本中修复。

CVSS 7.1 · High EPSS 0.18% · P6

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-2026-84312

Vulnerability Information
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Vulnerability Title
Nginx UI: Casdoor SSO callback uses a constant `state` parameter (login CSRF)
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, GetCasdoorUri uses the configured Casdoor application name as a constant OAuth state value and CasdoorCallback does not compare the submitted state with a value bound to the initiating browser session. An unauthenticated attacker can cause a victim's browser to complete an attacker-controlled Casdoor authorization flow, and the callback can mint a Nginx UI session for the identity returned by that authorization code. 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:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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-2026-84312

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III. Intelligence Information for CVE-2026-84312

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Vendor Advisories for CVE-2026-84312 (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-2026-84316 8.8 HIGH Nginx UI: nginx config directive denylist (ValidateConfigFile) is bypassable via same-line
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-2026-84320 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-287

V. Comments for CVE-2026-84312

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