diff --git a/core/src/main/java/hudson/PluginWrapper.java b/core/src/main/java/hudson/PluginWrapper.java
index a77df0d3bca6..094b79ce9bfa 100644
--- a/core/src/main/java/hudson/PluginWrapper.java
+++ b/core/src/main/java/hudson/PluginWrapper.java
@@ -522,6 +522,7 @@ public PluginWrapper(PluginManager parent, File archive, Manifest manifest, URL
         this.archive = archive;
     }
 
+    @Exported(visibility = 2)
     @Override
     public String getDisplayName() {
         String displayName = getLongName();
@@ -595,7 +596,7 @@ public List<Dependency> getOptionalDependencies() {
     /**
      * Returns the short name suitable for URL.
      */
-    @Exported
+    @Exported(visibility = 2)
     public String getShortName() {
         return shortName;
     }
@@ -627,7 +628,7 @@ public String getShortName() {
      *      null if this information is unavailable.
      * @since 1.283
      */
-    @Exported
+    @Exported(visibility = 2)
     public String getUrl() {
         // first look in update center metadata
         List<UpdateSite.Plugin> siteMetadataList = getInfoFromAllSites();
@@ -683,7 +684,7 @@ public YesNoMaybe supportsDynamicLoad() {
     /**
      * Returns the version number of this plugin
      */
-    @Exported
+    @Exported(visibility = 2)
     public String getVersion() {
         return getVersionOf(manifest);
     }
@@ -894,7 +895,7 @@ private Set<String> dependentsToCheck(PluginDisableStrategy strategy) {
     /**
      * Returns true if this plugin is enabled for this session.
      */
-    @Exported
+    @Exported(visibility = 2)
     public boolean isActive() {
         return active && !hasCycleDependency();
     }
@@ -921,7 +922,7 @@ public boolean isBundled() {
      * If true, the plugin is going to be activated next time
      * Jenkins runs.
      */
-    @Exported
+    @Exported(visibility = 2)
     public boolean isEnabled() {
         return !disableFile.exists();
     }
@@ -1080,7 +1081,7 @@ private List<UpdateSite.Plugin> getInfoFromAllSites() {
      * This method is conservative in the sense that if the version number is incomprehensible,
      * it always returns false.
      */
-    @Exported
+    @Exported(visibility = 2)
     public boolean hasUpdate() {
         return getUpdateInfo() != null;
     }
diff --git a/test/src/test/java/hudson/PluginManagerTest.java b/test/src/test/java/hudson/PluginManagerTest.java
index 8c8306b94d87..a7c6421ff2d7 100644
--- a/test/src/test/java/hudson/PluginManagerTest.java
+++ b/test/src/test/java/hudson/PluginManagerTest.java
@@ -542,6 +542,36 @@ void pluginListJSONApi() throws Throwable {
         });
     }
 
+    @Issue("https://github.com/jenkinsci/jenkins/issues/21047")
+    @WithPlugin("htmlpublisher.jpi")
+    @Test
+    void pluginManagerApiJsonReturnsPluginDetails() throws Throwable {
+        session.then(r -> {
+            JSONObject response = r.getJSON("pluginManager/api/json").getJSONObject();
+            JSONArray plugins = response.getJSONArray("plugins");
+            assertThat(plugins, not(empty()));
+
+            // Find the htmlpublisher plugin in the response
+            JSONObject htmlPublisher = null;
+            for (int i = 0; i < plugins.size(); i++) {
+                JSONObject plugin = plugins.getJSONObject(i);
+                if ("htmlpublisher".equals(plugin.optString("shortName"))) {
+                    htmlPublisher = plugin;
+                    break;
+                }
+            }
+            assertNotNull(htmlPublisher, "htmlpublisher plugin should be present in API response");
+
+            // Verify key properties are present at default depth (visibility = 2)
+            assertNotNull(htmlPublisher.optString("shortName", null), "shortName should be exported at default depth");
+            assertNotNull(htmlPublisher.optString("version", null), "version should be exported at default depth");
+            assertNotNull(htmlPublisher.optString("displayName", null), "displayName should be exported at default depth");
+            assertTrue(htmlPublisher.has("active"), "active should be exported at default depth");
+            assertTrue(htmlPublisher.has("enabled"), "enabled should be exported at default depth");
+            assertTrue(htmlPublisher.has("hasUpdate"), "hasUpdate should be exported at default depth");
+        });
+    }
+
     @Issue("JENKINS-41684")
     @Test
     void requireSystemDuringLoad() throws Throwable {