diff --git a/.changeset/tidy-poets-shake.md b/.changeset/tidy-poets-shake.md
new file mode 100644
index 000000000..c886dc719
--- /dev/null
+++ b/.changeset/tidy-poets-shake.md
@@ -0,0 +1,5 @@
+---
+'@blinkk/root-cms': patch
+---
+
+Send CSV imports as JSON instead of multipart/form-data. Some deployments sit behind WAFs/proxies that block multipart requests; the csv.import endpoint now accepts a JSON body (`{"csv": "..."}`) and the CMS UI sends JSON. Multipart uploads remain supported for backwards compatibility.
diff --git a/packages/root-cms/core/api.ts b/packages/root-cms/core/api.ts
index adf7a8f64..bd7a7c7b2 100644
--- a/packages/root-cms/core/api.ts
+++ b/packages/root-cms/core/api.ts
@@ -388,6 +388,11 @@ export function api(server: Server, options: ApiOptions) {
    * Imports a CSV file and returns a JSON array of objects representing the
    * CSV.
    *
+   * Accepts either a JSON body (`{"csv": "<csv text>"}`) or a
+   * `multipart/form-data` upload with a `file` field. The CMS UI sends JSON
+   * since some deployments sit behind WAFs that block multipart requests;
+   * multipart is kept for backwards compatibility.
+   *
    * Sample response:
    *
    * ```json
@@ -404,14 +409,21 @@ export function api(server: Server, options: ApiOptions) {
     '/cms/api/csv.import',
     multipartMiddleware(),
     (req: Request, res: Response) => {
-      if (req.method !== 'POST' || !req.files || !req.files.file) {
+      if (req.method !== 'POST') {
         res.status(400).json({success: false, error: 'BAD_REQUEST'});
         return;
       }
 
       try {
-        const file = req.files.file;
-        const csvString = file.buffer.toString('utf8');
+        let csvString: string;
+        if (req.files?.file) {
+          csvString = req.files.file.buffer.toString('utf8');
+        } else if (typeof req.body?.csv === 'string') {
+          csvString = req.body.csv;
+        } else {
+          res.status(400).json({success: false, error: 'BAD_REQUEST'});
+          return;
+        }
         const rows = csvToArray(csvString);
         res.status(200).json({success: true, data: rows});
       } catch (err) {
diff --git a/packages/root-cms/core/plugin.ts b/packages/root-cms/core/plugin.ts
index 3de607a92..87989294a 100644
--- a/packages/root-cms/core/plugin.ts
+++ b/packages/root-cms/core/plugin.ts
@@ -870,11 +870,16 @@ export function cmsPlugin(options: CMSPluginOptions): CMSPlugin {
       serverOptions: ConfigureServerOptions
     ) => {
       // The AI "prepare" routes can carry a moderately large body (the edit
-      // flow sends the JSON object being edited). Use a larger limit for those
-      // routes only; body-parser short-circuits when `req._body` is already
-      // set, so the global parser below is a no-op for them.
+      // flow sends the JSON object being edited), and csv.import receives the
+      // full CSV text as JSON. Use a larger limit for those routes only;
+      // body-parser short-circuits when `req._body` is already set, so the
+      // global parser below is a no-op for them.
       server.use(
-        ['/cms/api/ai.chat.prepare', '/cms/api/ai.edit.prepare'],
+        [
+          '/cms/api/ai.chat.prepare',
+          '/cms/api/ai.edit.prepare',
+          '/cms/api/csv.import',
+        ],
         bodyParser.json({limit: '4mb'})
       );
       server.use(bodyParser.json());
diff --git a/packages/root-cms/ui/components/LocalizationModal/LocalizationModal.tsx b/packages/root-cms/ui/components/LocalizationModal/LocalizationModal.tsx
index 2ffa526b4..03102434d 100644
--- a/packages/root-cms/ui/components/LocalizationModal/LocalizationModal.tsx
+++ b/packages/root-cms/ui/components/LocalizationModal/LocalizationModal.tsx
@@ -711,12 +711,14 @@ LocalizationModal.Translations = (props: TranslationsProps) => {
     fileInput.addEventListener('change', async () => {
       const file = fileInput.files?.[0];
       if (file) {
-        const formData = new FormData();
-        formData.append('file', file);
         try {
+          // Send the CSV as JSON rather than multipart/form-data; some
+          // deployments sit behind WAFs that block multipart requests.
+          const csv = await file.text();
           const res = await fetch('/cms/api/csv.import', {
             method: 'POST',
-            body: formData,
+            headers: {'Content-Type': 'application/json'},
+            body: JSON.stringify({csv}),
           });
           if (res.status !== 200) {
             const errorText = await res.text();