diff --git a/app/brave_settings_strings.grdp b/app/brave_settings_strings.grdp
index 57ee4ffe31a7..8b0cc30718f5 100644
--- a/app/brave_settings_strings.grdp
+++ b/app/brave_settings_strings.grdp
@@ -489,6 +489,9 @@
   <message name="IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_NOT_FOUND_ERROR" desc="Error message">
     Scriptlet is not found.
   </message>
+  <message name="IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_WARNING" desc="A warning message in Scriptlet editor.">
+    Don’t paste code here that you don’t understand or haven’t\nreviewed yourself. This could allow attackers to steal your\nidentity or take control of your computer.
+  </message>
 
   <message name="IDS_SETTINGS_BRAVE_SHORTCUTS_TITLE" desc="The text label for the shortcuts settings page">
     Shortcuts
diff --git a/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.html b/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.html
index 7729afcb5a79..317d2255b76f 100644
--- a/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.html
+++ b/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.html
@@ -36,7 +36,8 @@
         </div>
         <div>
             <div class="flex content">$i18n{adblockCustomScriptletDialogContentLabel}</div>
-            <textarea id="scriptlet-content" multiline="true" value="{{scriptlet.content::input}}" spellcheck="false">
+            <textarea id="scriptlet-content" multiline="true" value="{{scriptlet.content::input}}" spellcheck="false"
+                placeholder="$i18n{adblockCustomScriptletWarning}">
             </textarea>
         </div>
     </div>
diff --git a/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.ts b/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.ts
index 1475c0e5bccf..063a553f84cd 100644
--- a/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.ts
+++ b/browser/resources/settings/default_brave_shields_page/components/brave_adblock_scriptlet_editor.ts
@@ -81,17 +81,17 @@ class AdblockScriptletEditor extends AdblockScriptletEditorBase {
         break
       case ErrorCode.kAlreadyExists:
         this.scriptletErrorMessage_ = this.i18n(
-          'adblockEditCustomScriptletAlreadyExistsError'
+          'adblockCustomScriptletAlreadyExistsError'
         )
         break
       case ErrorCode.kInvalidName:
         this.scriptletErrorMessage_ = this.i18n(
-          'adblockEditCustomScriptletInvalidNameError'
+          'adblockCustomScriptletInvalidNameError'
         )
         break
       case ErrorCode.kNotFound:
         this.scriptletErrorMessage_ = this.i18n(
-          'adblockEditCustomScriptletNotFoundError'
+          'adblockCustomScriptletNotFoundError'
         )
         break
     }
diff --git a/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc b/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
index f834e9b1052a..392d588b31a3 100644
--- a/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
+++ b/browser/ui/webui/settings/brave_settings_localized_strings_provider.cc
@@ -749,12 +749,14 @@ void BraveAddCommonStrings(content::WebUIDataSource* html_source,
        IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_DIALOG_SAVE_BUTTON},
       {"adblockCustomScriptletDeleteConfirmation",
        IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_DELETE_CONFIRMATION},
-      {"adblockEditCustomScriptletAlreadyExistsError",
+      {"adblockCustomScriptletAlreadyExistsError",
        IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_ALREADY_EXISTS_ERROR},
-      {"adblockEditCustomScriptletInvalidNameError",
+      {"adblockCustomScriptletInvalidNameError",
        IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_INVALID_NAME_ERROR},
-      {"adblockEditCustomScriptletNotFoundError",
+      {"adblockCustomScriptletNotFoundError",
        IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_NOT_FOUND_ERROR},
+      {"adblockCustomScriptletWarning",
+       IDS_BRAVE_ADBLOCK_CUSTOM_SCRIPTLET_WARNING},
 
       {"braveShortcutsPage", IDS_SETTINGS_BRAVE_SHORTCUTS_TITLE},
       {"shortcutsPageSearchPlaceholder", IDS_SHORTCUTS_PAGE_SEARCH_PLACEHOLDER},