CVE-2026-46717: Nezha Monitoring: RoleMember-reachable SSRF with full response-body reflection via POST /api/v1/notification

nezha’s dashboard supports two user roles: RoleAdmin (Role==0) and RoleMember (Role==1). The notification routes POST /api/v1/notification and PATCH /api/v1/notification/:id are wired through commonHandler rather than adminHandler — so a RoleMember user can call them. These handlers synchronously Send() an HTTP request to a user-controlled URL and reflect the entire response body (no size limit) back to the caller on any non-2xx response.

Net effect: a low-privilege RoleMember can read intranet HTTP response bodies via the dashboard’s hub.