diff --git a/hive/gateway/gateway.go b/hive/gateway/gateway.go
index c61055492..4fbce602c 100644
--- a/hive/gateway/gateway.go
+++ b/hive/gateway/gateway.go
@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"net"
 	"net/http"
 	"net/url"
 	"os"
@@ -106,10 +107,55 @@ func (gw *GatewayConfig) SetupRoutes() http.Handler {
 	return r
 }
 
-// corsMiddleware adds CORS headers for browser requests from the dev UI.
+// corsAllowedOrigins builds the set of allowed CORS origins from localhost and
+// all local non-loopback IPs on the hive-ui port (default 3000). This allows
+// the UI to be accessed from any local address, not just localhost.
+func corsAllowedOrigins() map[string]struct{} {
+	origins := map[string]struct{}{
+		"https://localhost:3000": {},
+	}
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return origins
+	}
+	for _, iface := range ifaces {
+		if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			if ip == nil || ip.IsLoopback() || ip.To4() == nil {
+				continue
+			}
+			origins[fmt.Sprintf("https://%s:3000", ip.String())] = struct{}{}
+		}
+	}
+	return origins
+}
+
+// corsMiddleware adds CORS headers for browser requests from the hive-ui.
 func corsMiddleware(next http.Handler) http.Handler {
+	allowed := corsAllowedOrigins()
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Access-Control-Allow-Origin", "https://localhost:3000")
+		origin := r.Header.Get("Origin")
+		if origin == "" {
+			origin = "https://localhost:3000"
+		}
+		if _, ok := allowed[origin]; ok {
+			w.Header().Set("Access-Control-Allow-Origin", origin)
+		} else {
+			w.Header().Set("Access-Control-Allow-Origin", "https://localhost:3000")
+		}
 		w.Header().Set("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,HEAD,OPTIONS")
 		w.Header().Set("Access-Control-Allow-Headers", "*")
 		w.Header().Set("Access-Control-Allow-Credentials", "true")
diff --git a/hive/gateway/gateway_test.go b/hive/gateway/gateway_test.go
index b933c6d24..7fb904063 100644
--- a/hive/gateway/gateway_test.go
+++ b/hive/gateway/gateway_test.go
@@ -860,6 +860,43 @@ func TestCorsMiddleware_OPTIONSRequest(t *testing.T) {
 	assert.Equal(t, "https://localhost:3000", w.Header().Get("Access-Control-Allow-Origin"))
 }
 
+func TestCorsMiddleware_LocalIPOrigin(t *testing.T) {
+	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(200)
+	})
+
+	handler := corsMiddleware(next)
+
+	// Request from a local IP should be reflected
+	allowed := corsAllowedOrigins()
+	for origin := range allowed {
+		if origin == "https://localhost:3000" {
+			continue
+		}
+		req := httptest.NewRequest("GET", "/", nil)
+		req.Header.Set("Origin", origin)
+		w := httptest.NewRecorder()
+		handler.ServeHTTP(w, req)
+		assert.Equal(t, origin, w.Header().Get("Access-Control-Allow-Origin"))
+		return // test one IP is enough
+	}
+}
+
+func TestCorsMiddleware_UnknownOrigin(t *testing.T) {
+	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(200)
+	})
+
+	handler := corsMiddleware(next)
+	req := httptest.NewRequest("GET", "/", nil)
+	req.Header.Set("Origin", "https://evil.example.com")
+	w := httptest.NewRecorder()
+	handler.ServeHTTP(w, req)
+
+	// Unknown origins fall back to localhost
+	assert.Equal(t, "https://localhost:3000", w.Header().Get("Access-Control-Allow-Origin"))
+}
+
 func TestSlogRequestLogger_CallsNext(t *testing.T) {
 	nextCalled := false
 	next := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {