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An incomplete fix for the previous secure-session requirement leaves sensitive cluster mutation endpoints unprotected. Specifically, the secure-session or OTP step-up middleware added to standard routers was omitted from the parallel cluster router. Consequently, authenticated users lacking a fresh secure-session can manage cluster nodes, manipulate namespaces, and trigger cluster-wide Nginx reloads or restarts using only a standard persisted or stolen JSON Web Token.
DailyCVE Form:
Platform: Nginx-UI
Version: HEAD 2cb7ee910
Vulnerability : Authorization Bypass
Severity: Critical
date: 2026-06-01
Prediction: 2026-06-15
What Undercode Say
The vulnerability stems from router grouping discrepancies where standard routes wrap handlers in a security middleware, while the cluster package routes attach directly to base authentication.
Analytics
Verify insecure cluster router registration points grep -rn "nodeGroup.POST" api/cluster/ grep -rn "RequireSecureSession" api/nginx/
Exploit: (Educational Purposes!)
Trigger cluster-wide Nginx reload using only a standard JWT without OTP step-up curl -X POST "http://target-server/api/nodes/reload_nginx" \ -H "Authorization: Bearer <STOLEN_JWT>" \ -H "Content-Type: application/json"
Protection:
Wrap all cluster-level mutation handlers, namespace controllers, and node management routes inside `middleware.RequireSecureSession()` within api/cluster/router.go.
Impact:
Unauthorized actors can execute privileged cluster operations, read or rewrite node tokens, manipulate cluster infrastructure configurations, and disrupt cluster-wide Nginx instances without completing secondary verification.
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Sources:
Reported By: github.com
Extra Source Hub:
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