diff --git a/server/routers.ts b/server/routers.ts
index 042d8f5..91a39a9 100644
--- a/server/routers.ts
+++ b/server/routers.ts
@@ -107,6 +107,7 @@ import { drawBapCartouche } from "./bapCartouche";
 import { resolveBapExportDestination } from "./exportDestinationResolver";
 import { startEmailImportService, stopEmailImportService, isEmailImportServiceRunning, triggerEmailCheck, triggerManualEmailCheck, testImapConnection } from "./emailImportService";
 import { startFolderImportService, stopFolderImportService, isFolderImportServiceRunning } from "./folderImportService";
+import { getSafeWebImportSourceError, logWebImportSourceSaveFailure } from "./webImportSourcesError";
 import { TRPCError } from "@trpc/server";
 import { processFreeproExcel } from "./freeproService";
 import { runFreeproAutoImport, testFreeproConnection, startFreeproAutoJob, stopFreeproAutoJob, frequencyToMs } from "./freeproAutoImport";
@@ -2731,7 +2732,14 @@ export const appRouter = router({
         autoEnabled: z.number().min(0).max(1).default(0),
       }))
       .mutation(async ({ input, ctx }) => {
-        return createWebImportSource({ ...input, userId: ctx.user.id });
+        try {
+          return await createWebImportSource({ ...input, userId: ctx.user.id });
+        } catch (error) {
+          // Les erreurs MySQL/Drizzle peuvent contenir la requête et les paramètres saisis.
+          // Elles restent masquées côté navigateur.
+          logWebImportSourceSaveFailure(error);
+          throw getSafeWebImportSourceError(error);
+        }
       }),
 
     update: protectedProcedure
diff --git a/server/webImportSourcesError.test.ts b/server/webImportSourcesError.test.ts
new file mode 100644
index 0000000..347f5a6
--- /dev/null
+++ b/server/webImportSourcesError.test.ts
@@ -0,0 +1,17 @@
+import { describe, expect, it } from "vitest";
+import { WEB_IMPORT_SOURCE_SAVE_ERROR, getSafeWebImportSourceError } from "./webImportSourcesError";
+
+describe("getSafeWebImportSourceError", () => {
+  it("never returns the SQL statement or connector parameters to the client", () => {
+    const databaseError = new Error(
+      "Failed query: insert into `webImportSources` (...) values (...) params: amazon@example.fr, secret-value",
+    );
+
+    const safeError = getSafeWebImportSourceError(databaseError);
+
+    expect(safeError.code).toBe("INTERNAL_SERVER_ERROR");
+    expect(safeError.message).toBe(WEB_IMPORT_SOURCE_SAVE_ERROR);
+    expect(safeError.message).not.toContain("insert into");
+    expect(safeError.message).not.toContain("secret-value");
+  });
+});
diff --git a/server/webImportSourcesError.ts b/server/webImportSourcesError.ts
new file mode 100644
index 0000000..907846a
--- /dev/null
+++ b/server/webImportSourcesError.ts
@@ -0,0 +1,25 @@
+import { TRPCError } from "@trpc/server";
+
+export const WEB_IMPORT_SOURCE_SAVE_ERROR =
+  "Impossible d’enregistrer le connecteur. Vérifiez les informations saisies puis réessayez.";
+
+/**
+ * Masque toute erreur Drizzle/MySQL avant son retour au navigateur : les erreurs
+ * de pilote peuvent contenir la requête SQL et les paramètres de connexion.
+ */
+export function getSafeWebImportSourceError(_error: unknown): TRPCError {
+  return new TRPCError({
+    code: "INTERNAL_SERVER_ERROR",
+    message: WEB_IMPORT_SOURCE_SAVE_ERROR,
+  });
+}
+
+/** Journalise uniquement les métadonnées techniques non sensibles. */
+export function logWebImportSourceSaveFailure(error: unknown): void {
+  const technicalCode =
+    error && typeof error === "object" && "code" in error && typeof error.code === "string"
+      ? error.code
+      : "unknown";
+
+  console.error("[WebImportSources] Échec d’enregistrement", { technicalCode });
+}