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CVE-2026-107804— Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout

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。在版本 2.2.0 到 2.6.0 之间，内置的反向代理未能保留 Gin 框架所需的客户端外部身份标识，因为后端未配置可信代理。这导致管理请求被归因于本地回环地址（loopback），从而绕过了 IP 白名单中的回环例外规则。尽管攻击者仍需有效的凭据才能成功登录，但来自不同外部客户端的失败登录尝试均被记录为同一个回环地址。这使得未经身份验证的攻击者可以触发针对密码或 OTP（一次性密码）认证的共享临时登录禁令，而不会影响其他已建立会话的有效性。该

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
0xJacky nginx-ui >= 2.2.0, < 2.6.0 affected
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I. Basic Information for CVE-2026-107804

Vulnerability Information
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Vulnerability Title
Nginx UI: Bundled reverse proxy can bypass IP allowlists and enable shared login lockout
Source: CVE Program / CVE List V5
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. From 2.2.0 until 2.6.0, the bundled reverse proxy does not preserve the external client identity used by Gin because the backend has no trusted proxy configuration. Management requests can be attributed to loopback and pass the IP allowlist loopback exception, although valid credentials are still required. Failed logins from different external clients are also attributed to the same loopback address, allowing an unauthenticated attacker to trigger a shared temporary login ban for password or OTP authentication without invalidating existing sessions. This issue is fixed in version 2.6.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
0xJacky nginx-ui >= 2.2.0, < 2.6.0 -

II. Public POCs for CVE-2026-107804

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-107804

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Vendor Advisories for CVE-2026-107804 (1)

Same Patch Batch · 0xJacky · 2026-10-09 · 10 CVEs total

CVE-2026-107806 9.4 CRITICAL Nginx UI: Authenticated Remote Code Execution via Backup Restore App Config Overwrite
CVE-2026-107807 8.8 HIGH Nginx UI: Node Secret Credential Exposure via URL Query Parameter
CVE-2026-107809 8.8 HIGH Nginx-UI AuthRequired token cookie fallback enables CSRF against management APIs
CVE-2026-107811 8.8 HIGH 0xJacky/nginx-ui /api/nodes Leaks Cluster Node Tokens and Allows Cross-Node Impersonation
CVE-2026-107813 8.8 HIGH Nginx UI: Incomplete fix of CVE-2026-84315 - the api/cluster router was not - wrapped in
CVE-2026-107808 8.1 HIGH Nginx UI: Authentication bypass: password login does not enforce a passkey-only second fac
CVE-2026-107810 8.1 HIGH Nginx UI: Backup restore follows crafted symlinks into the live Nginx configuration path b
CVE-2026-107805 7.5 HIGH Nginx UI: Unauthenticated signed-request body staging can exhaust temporary storage
CVE-2026-107812 7.5 HIGH Nginx UI: Self-upgrade runs an unsigned binary verified only by a same-origin digest → RCE

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-346

V. Comments for CVE-2026-107804

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