diff --git a/frontend/editor/src/core/pages/MobileScannerPage.tsx b/frontend/editor/src/core/pages/MobileScannerPage.tsx
index ca797a6c3..0424125aa 100644
--- a/frontend/editor/src/core/pages/MobileScannerPage.tsx
+++ b/frontend/editor/src/core/pages/MobileScannerPage.tsx
@@ -21,6 +21,10 @@ import UploadRoundedIcon from "@mui/icons-material/UploadRounded";
 import AddPhotoAlternateRoundedIcon from "@mui/icons-material/AddPhotoAlternateRounded";
 import CheckCircleRoundedIcon from "@mui/icons-material/CheckCircleRounded";
 import { loadJscanify } from "@app/utils/loadJscanify";
+import apiClient from "@app/services/apiClient";
+
+// Use the configured API base (e.g. api.stirling.com), not the page origin.
+const API_BASE = (apiClient.defaults.baseURL ?? "").replace(/\/+$/, "");
 
 /**
  * MobileScannerPage
@@ -83,7 +87,7 @@ export default function MobileScannerPage() {
 
       try {
         const response = await fetch(
-          `/api/v1/mobile-scanner/validate-session/${sessionId}`,
+          `${API_BASE}/api/v1/mobile-scanner/validate-session/${sessionId}`,
         );
 
         if (response.ok) {
@@ -841,7 +845,7 @@ export default function MobileScannerPage() {
       });
 
       const uploadResponse = await fetch(
-        `/api/v1/mobile-scanner/upload/${sessionId}`,
+        `${API_BASE}/api/v1/mobile-scanner/upload/${sessionId}`,
         {
           method: "POST",
           body: formData,
diff --git a/frontend/editor/src/core/utils/loadJscanify.ts b/frontend/editor/src/core/utils/loadJscanify.ts
index 2057ddbdc..93dec0039 100644
--- a/frontend/editor/src/core/utils/loadJscanify.ts
+++ b/frontend/editor/src/core/utils/loadJscanify.ts
@@ -1,3 +1,5 @@
+import { withBasePath } from "@app/constants/app";
+
 declare global {
   interface Window {
     cv?: any;
@@ -5,8 +7,9 @@ declare global {
   }
 }
 
-const OPENCV_SRC = "/vendor/jscanify/opencv.js";
-const JSCANIFY_SRC = "/vendor/jscanify/jscanify.js";
+// Served under the app's base path (handles sub-path deploys like /app).
+const OPENCV_SRC = withBasePath("/vendor/jscanify/opencv.js");
+const JSCANIFY_SRC = withBasePath("/vendor/jscanify/jscanify.js");
 
 let loadPromise: Promise<void> | null = null;