diff --git a/core/src/main/java/hudson/model/Descriptor.java b/core/src/main/java/hudson/model/Descriptor.java
index 562b96e37b8e..33c981d657f5 100644
--- a/core/src/main/java/hudson/model/Descriptor.java
+++ b/core/src/main/java/hudson/model/Descriptor.java
@@ -24,7 +24,6 @@
 
 package hudson.model;
 
-import static hudson.util.QuotedStringTokenizer.quote;
 import static jakarta.servlet.http.HttpServletResponse.SC_NOT_FOUND;
 
 import edu.umd.cs.findbugs.annotations.CheckForNull;
@@ -1306,7 +1305,7 @@ public String getFormField() {
         @Override
         public void generateResponse(StaplerRequest2 req, StaplerResponse2 rsp, Object node) throws IOException, ServletException {
             if (FormApply.isApply(req)) {
-                FormApply.applyResponse("notificationBar.show(" + quote(getMessage()) + ",notificationBar.ERROR)")
+                FormApply.showNotification(getMessage(), FormApply.NotificationType.ERROR)
                         .generateResponse(req, rsp, node);
             } else {
                 // for now, we can't really use the field name that caused the problem.
diff --git a/core/src/main/java/hudson/util/FormApply.java b/core/src/main/java/hudson/util/FormApply.java
index 280a3051286a..9fc5f578f05d 100644
--- a/core/src/main/java/hudson/util/FormApply.java
+++ b/core/src/main/java/hudson/util/FormApply.java
@@ -24,8 +24,10 @@
 
 package hudson.util;
 
+import hudson.Functions;
 import jakarta.servlet.ServletException;
 import java.io.IOException;
+import jenkins.model.Jenkins;
 import org.kohsuke.stapler.HttpResponses.HttpResponseException;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerRequest2;
@@ -51,7 +53,7 @@ public static HttpResponseException success(final String destination) {
             public void generateResponse(StaplerRequest2 req, StaplerResponse2 rsp, Object node) throws IOException, ServletException {
                 if (isApply(req)) {
                     // if the submission is via 'apply', show a response in the notification bar
-                    applyResponse("notificationBar.show('" + Messages.HttpResponses_Saved() + "',notificationBar.SUCCESS)")
+                    showNotification(Messages.HttpResponses_Saved(), NotificationType.SUCCESS)
                             .generateResponse(req, rsp, node);
                 } else {
                     rsp.sendRedirect(destination);
@@ -69,6 +71,7 @@ public static boolean isApply(StaplerRequest2 req) {
         return Boolean.parseBoolean(req.getParameter("core:apply"));
     }
 
+
     /**
      * @deprecated use {@link #isApply(StaplerRequest2)}
      */
@@ -82,7 +85,10 @@ public static boolean isApply(StaplerRequest req) {
      * <p>
      * When the response HTML includes a JavaScript function in a pre-determined name, that function gets executed.
      * This method generates such a response from JavaScript text.
+     *
+     * @deprecated use {@link #showNotification(String, NotificationType)} instead, which is CSP compatible version
      */
+    @Deprecated
     public static HttpResponseException applyResponse(final String script) {
         return new HttpResponseException() {
             @Override
@@ -98,4 +104,36 @@ public void generateResponse(StaplerRequest2 req, StaplerResponse2 rsp, Object n
             }
         };
     }
+
+    /**
+     * Generates the response for the asynchronous background form submission (AKA the Apply button),
+     * that will show a notification of certain type and with provided message.
+     *
+     * @param message a message to display in the popup. Only plain text is supported.
+     * @param notificationType type of notification. See {@link NotificationType} for supported types. Defines the notification
+     *                         color and the icon that will be shown.
+     *
+     * @since TODO
+     */
+    public static HttpResponseException showNotification(final String message, final NotificationType notificationType) {
+        return new HttpResponseException() {
+            @Override
+            public void generateResponse(StaplerRequest2 req, StaplerResponse2 rsp, Object node) throws IOException {
+                rsp.setContentType("text/html;charset=UTF-8");
+                rsp.getWriter().println("<script id='form-apply-data-holder' data-message='" + Functions.htmlAttributeEscape(message) + "' " +
+                        "data-notification-type='" + notificationType + "' " +
+                        "src='" + req.getContextPath() + Jenkins.RESOURCE_PATH + "/scripts/apply.js" + "'></script>");
+            }
+        };
+    }
+
+
+    /**
+     * Corresponds to types declared in <a href="https://github.com/jenkinsci/jenkins/blob/74610e024a6b8fd8feccdc51b8f7741aa6c30e3b/war/src/main/js/components/notifications/index.js#L13-L25">index.js</a>
+     */
+    public enum NotificationType {
+        SUCCESS,
+        WARNING,
+        ERROR
+    }
 }
diff --git a/war/src/main/webapp/scripts/apply.js b/war/src/main/webapp/scripts/apply.js
new file mode 100644
index 000000000000..b82153250bf6
--- /dev/null
+++ b/war/src/main/webapp/scripts/apply.js
@@ -0,0 +1,8 @@
+window.applyCompletionHandler = function (w) {
+  let scriptTagData = document.getElementById("form-apply-data-holder").dataset;
+
+  w.notificationBar.show(
+    scriptTagData.message,
+    w.notificationBar[scriptTagData.notificationType],
+  );
+};