diff --git a/src/server/index.tsx b/src/server/index.tsx
index e220cd6..f96901b 100644
--- a/src/server/index.tsx
+++ b/src/server/index.tsx
@@ -25,6 +25,7 @@ import {
   favIconUrl,
   initializeSite,
   isAuthPath,
+  md,
 } from "../shared/utils";
 
 const server = express();
@@ -347,7 +348,9 @@ async function createSsrHtml(root: string, isoData: IsoDataOptionalSite) {
   <!DOCTYPE html>
   <html ${helmet.htmlAttributes.toString()} lang="en">
   <head>
-  <script>window.isoData = ${JSON.stringify(isoData)}</script>
+  <script>window.isoData = ${md.utils.escapeHtml(
+    JSON.stringify(isoData)
+  )}</script>
   <script>window.lemmyConfig = ${serialize(config)}</script>
 
   <!-- A remote debugging utility for mobile -->
