diff --git a/src/lib/components/chat/FileNav/PortPreview.svelte b/src/lib/components/chat/FileNav/PortPreview.svelte
index f4c184af99..fc7076db58 100644
--- a/src/lib/components/chat/FileNav/PortPreview.svelte
+++ b/src/lib/components/chat/FileNav/PortPreview.svelte
@@ -269,7 +269,7 @@
 				src={proxyUrl}
 				title="Port {port} preview"
 				class="w-full h-full border-0 bg-white"
-				sandbox="allow-scripts{($settings?.terminalPreviewAllowSameOrigin ?? true)
+				sandbox="allow-scripts{($settings?.terminalPreviewAllowSameOrigin ?? false)
 					? ' allow-same-origin'
 					: ''} allow-forms allow-popups allow-modals allow-downloads"
 				on:load={onIframeLoad}
diff --git a/src/lib/components/common/InterfaceSettings.svelte b/src/lib/components/common/InterfaceSettings.svelte
index 8471aa85c4..e32672aa86 100644
--- a/src/lib/components/common/InterfaceSettings.svelte
+++ b/src/lib/components/common/InterfaceSettings.svelte
@@ -109,7 +109,7 @@
 	let iframeSandboxAllowSameOrigin = false;
 	let iframeSandboxAllowForms = true;
 	let iframeSandboxAllowDownloads = true;
-	let terminalPreviewAllowSameOrigin = true;
+	let terminalPreviewAllowSameOrigin = false;
 
 	let showManageFloatingActionButtonsModal = false;
 	let showManageImageCompressionModal = false;
@@ -311,7 +311,7 @@
 		iframeSandboxAllowSameOrigin = currentSettings?.iframeSandboxAllowSameOrigin ?? false;
 		iframeSandboxAllowForms = currentSettings?.iframeSandboxAllowForms ?? true;
 		iframeSandboxAllowDownloads = currentSettings?.iframeSandboxAllowDownloads ?? true;
-		terminalPreviewAllowSameOrigin = currentSettings?.terminalPreviewAllowSameOrigin ?? true;
+		terminalPreviewAllowSameOrigin = currentSettings?.terminalPreviewAllowSameOrigin ?? false;
 
 		stylizedPdfExport = currentSettings?.stylizedPdfExport ?? true;