CVE-2026-53519

### Summary `fallbackToFrontend` in the dashboard's `NoRoute` handler treats any URL whose **raw string** starts with `/dashboard` as an admin-frontend asset request. The check uses `strings.HasPrefix`, not a path-segment match, so the input `/dashboard../data/config.yaml` is accepted; `strings.TrimPrefix` leaves `../data/config.yaml`; and `path.Join("admin-dist", "../data/config.yaml")` normalizes to `data/config.yaml` — which `os.Stat` finds and `http.ServeFile` returns. No authentication required. In default deployments (the values shipped in `model/config.go` and the layout shipped in the project `Dockerfile`) `data/config.yaml` contains the HS256 `jwt_secret_key` used by `cmd/dashboard/controller/jwt.go` to sign every dashboard session cookie. A unauth attacker reads that secret, forges an admin JWT, and signs in as any user — full dashboard takeover from one GET request. ### Details ## Root cause ```go // cmd/dashboard/controller/controller.go @ 636f4a9 387: fallbackStatusCode := getFallbackStatusCode(c.Request.URL.Path) 388: if strings.HasPrefix(c.Request.URL.Path, "/dashboard") { 389: stripPath := strings.TrimPrefix(c.Request.URL.Path, "/dashboard") 390: localFilePath := path.Join(singleton.Conf.AdminTemplate, stripPath) 391: if checkLocalFileOrFs(c, frontendDist, localFilePath, http.StatusOK) { 392: return 393: } ``` ```go // cmd/dashboard/controller/controller.go @ 636f4a9 322: func fallbackToFrontend(frontendDist fs.FS) func(*gin.Context) { 323: checkLocalFileOrFs := func(c *gin.Context, fs fs.FS, path string, customStatusCode int) bool { 324: if _, err := os.Stat(path); err == nil { 325: http.ServeFile(utils.NewGinCustomWriter(c, customStatusCode), c.Request, path) 326: return true 327: } ``` `fallbackToFrontend` is wired as the catch-all at `cmd/dashboard/controller/controller.go:157` — `r.NoRoute(fallbackToFrontend(frontendDist))` — so every URL not matche