diff --git a/libcef/browser/alloy/alloy_content_browser_client.cc b/libcef/browser/alloy/alloy_content_browser_client.cc
index 1cbf52f3e..dec3fe7a5 100644
--- a/libcef/browser/alloy/alloy_content_browser_client.cc
+++ b/libcef/browser/alloy/alloy_content_browser_client.cc
@@ -633,6 +633,7 @@ void AlloyContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
       additional_allowed_schemes);
   additional_allowed_schemes->push_back(content::kChromeDevToolsScheme);
   additional_allowed_schemes->push_back(content::kChromeUIScheme);
+  additional_allowed_schemes->push_back(content::kChromeUIUntrustedScheme);
 }
 
 bool AlloyContentBrowserClient::IsWebUIAllowedToMakeNetworkRequests(
diff --git a/libcef/browser/net/chrome_scheme_handler.cc b/libcef/browser/net/chrome_scheme_handler.cc
index 3127d3de8..db61d74a0 100644
--- a/libcef/browser/net/chrome_scheme_handler.cc
+++ b/libcef/browser/net/chrome_scheme_handler.cc
@@ -530,8 +530,10 @@ class CefWebUIControllerFactory : public content::WebUIControllerFactory {
 
   // Returns true if WebUI is allowed to handle the specified |url|.
   static bool AllowWebUIForURL(const GURL& url) {
-    if (!url.SchemeIs(content::kChromeUIScheme))
+    if (!url.SchemeIs(content::kChromeUIScheme) &&
+        !url.SchemeIs(content::kChromeUIUntrustedScheme)) {
       return false;
+    }
 
     if (IsAllowedWebUIHost(url.host()))
       return true;
diff --git a/libcef/common/alloy/alloy_main_delegate.cc b/libcef/common/alloy/alloy_main_delegate.cc
index dfa353d78..b26337da3 100644
--- a/libcef/common/alloy/alloy_main_delegate.cc
+++ b/libcef/common/alloy/alloy_main_delegate.cc
@@ -38,6 +38,7 @@
 #include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
+#include "content/public/common/url_constants.h"
 #include "extensions/common/constants.h"
 #include "net/base/features.h"
 #include "pdf/pdf_ppapi.h"
@@ -60,7 +61,8 @@
 namespace {
 
 const char* const kNonWildcardDomainNonPortSchemes[] = {
-    extensions::kExtensionScheme};
+    extensions::kExtensionScheme, content::kChromeDevToolsScheme,
+    content::kChromeUIScheme, content::kChromeUIUntrustedScheme};
 const size_t kNonWildcardDomainNonPortSchemesSize =
     base::size(kNonWildcardDomainNonPortSchemes);
 
diff --git a/libcef/common/net/scheme_registration.cc b/libcef/common/net/scheme_registration.cc
index f8ff779b5..b377b1a58 100644
--- a/libcef/common/net/scheme_registration.cc
+++ b/libcef/common/net/scheme_registration.cc
@@ -59,6 +59,7 @@ bool IsInternalHandledScheme(const std::string& scheme) {
       url::kBlobScheme,
       content::kChromeDevToolsScheme,
       content::kChromeUIScheme,
+      content::kChromeUIUntrustedScheme,
       url::kDataScheme,
       extensions::kExtensionScheme,
       url::kFileScheme,