diff --git a/extensions/markdown-language-features/markdown-editor-src/editor.ts b/extensions/markdown-language-features/markdown-editor-src/editor.ts
index 501b09a0c60657..5d8e460617659b 100644
--- a/extensions/markdown-language-features/markdown-editor-src/editor.ts
+++ b/extensions/markdown-language-features/markdown-editor-src/editor.ts
@@ -248,11 +248,14 @@ class Editor extends Disposable {
 	#createView(host: HTMLElement, content: string): void {
 		const model = this.model;
 		const scriptNonce = document.querySelector<HTMLMetaElement>('meta[name="vscode-markdown-editor-script-nonce"]')?.content;
+		const iframeBootstrapUrl = new URL(location.href);
+		// Nested frames must use the empty webview bootstrap, not the restricted index.html entrypoint.
+		iframeBootstrapUrl.pathname = '/fake.html';
 		const embeddedCodeEditorFactory = this._register(new VirtualizedIframeEmbeddedEditorFactory({
 			providers: this.#createIframeProviders(this.#codeBlockEditorProviders),
 			scriptNonce,
 			themeCss: () => `:root { ${document.documentElement.getAttribute('style') ?? ''} }`,
-			iframeBootstrapUrl: location.href,
+			iframeBootstrapUrl: iframeBootstrapUrl.href,
 			onAmbiguous: (language, providers) => this.#vscode.postMessage({
 				type: 'codeBlockEditorDiagnostic',
 				message: `Ambiguous providers for ${language}: ${providers.map(provider => provider.id).join(', ')}`,
diff --git a/extensions/markdown-language-features/package-lock.json b/extensions/markdown-language-features/package-lock.json
index 5a14bcc4bada2f..9c9cb70cafc09d 100644
--- a/extensions/markdown-language-features/package-lock.json
+++ b/extensions/markdown-language-features/package-lock.json
@@ -10,7 +10,7 @@
       "license": "MIT",
       "dependencies": {
         "@vscode/extension-telemetry": "^0.9.8",
-        "@vscode/markdown-editor": "^0.0.2-88",
+        "@vscode/markdown-editor": "^0.0.2-90",
         "@vscode/observables": "^0.1.1-0",
         "dompurify": "^3.4.10",
         "highlight.js": "^11.8.0",
@@ -633,9 +633,9 @@
       "integrity": "sha512-ukOMWnCg1tCvT7WnDfsUKQOFDQGsyR5tNgRpwmqi+5/vzU3ghdDXzvIM4IOPdSb3OeSsBNvmSL8nxIVOqi2WXA=="
     },
     "node_modules/@vscode/markdown-editor": {
-      "version": "0.0.2-88",
-      "resolved": "https://registry.npmjs.org/@vscode/markdown-editor/-/markdown-editor-0.0.2-88.tgz",
-      "integrity": "sha512-vN4vtf1QRF79BKZBA3ufuluFgqeb3uASOnsNcmm2bDHxZjgeRLiji+fgTkP//I+Qg/A68lelk/8K6SMQ933bTA==",
+      "version": "0.0.2-90",
+      "resolved": "https://registry.npmjs.org/@vscode/markdown-editor/-/markdown-editor-0.0.2-90.tgz",
+      "integrity": "sha512-qbiADnvlakn+vlMJRM/0Y9+HhmQLrPUaI1QJIW0qZCShP5p+NjOaquKTqP5dxF28uBfngA0nLMGNdzGXAL+AtQ==",
       "license": "MIT",
       "dependencies": {
         "@vscode/codicons": "0.0.46-36",
diff --git a/extensions/markdown-language-features/package.json b/extensions/markdown-language-features/package.json
index c51f87715c44ef..5d53ed24343381 100644
--- a/extensions/markdown-language-features/package.json
+++ b/extensions/markdown-language-features/package.json
@@ -1791,7 +1791,7 @@
   },
   "dependencies": {
     "@vscode/extension-telemetry": "^0.9.8",
-    "@vscode/markdown-editor": "^0.0.2-88",
+    "@vscode/markdown-editor": "^0.0.2-90",
     "@vscode/observables": "^0.1.1-0",
     "dompurify": "^3.4.10",
     "highlight.js": "^11.8.0",