diff --git a/projects/packages/jetpack-mu-wpcom/changelog/remove-theme-showcase-action-from-theme-details b/projects/packages/jetpack-mu-wpcom/changelog/remove-theme-showcase-action-from-theme-details
new file mode 100644
index 0000000000000..c4060e6a278ff
--- /dev/null
+++ b/projects/packages/jetpack-mu-wpcom/changelog/remove-theme-showcase-action-from-theme-details
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Themes: Fixed an issue that was showing a broken Theme Showcase action in the active theme details
diff --git a/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/js/theme-actions.js b/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/js/theme-actions.js
new file mode 100644
index 0000000000000..e0a7cd84f518a
--- /dev/null
+++ b/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/js/theme-actions.js
@@ -0,0 +1,32 @@
+const wpcomThemesRemoveWpcomActions = () => {
+	const themeOverlay = document.querySelector( '.theme-overlay' );
+	if ( ! themeOverlay ) {
+		return;
+	}
+
+	const observer = new MutationObserver( mutations => {
+		for ( const mutation of mutations ) {
+			for ( const node of mutation.addedNodes ) {
+				// If this is not an overlay for the active theme, bail and check the next node.
+				if (
+					! node.classList.contains( 'theme-overlay' ) ||
+					! node.classList.contains( 'active' )
+				) {
+					continue;
+				}
+
+				const themeActions = node.querySelector( '.theme-actions .active-theme' );
+				for ( const action of themeActions?.children ?? [] ) {
+					if ( action.getAttribute( 'href' )?.includes( 'https://wordpress.com' ) ) {
+						themeActions.removeChild( action );
+					}
+				}
+				return;
+			}
+		}
+	} );
+
+	observer.observe( themeOverlay, { childList: true } );
+};
+
+document.addEventListener( 'DOMContentLoaded', wpcomThemesRemoveWpcomActions );
diff --git a/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/wpcom-themes.php b/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/wpcom-themes.php
index 2de09536330bb..714831e387b4d 100644
--- a/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/wpcom-themes.php
+++ b/projects/packages/jetpack-mu-wpcom/src/features/wpcom-themes/wpcom-themes.php
@@ -61,6 +61,33 @@ function wpcom_themes_add_theme_showcase_menu() {
 	}
 
 	$site_slug = wp_parse_url( home_url(), PHP_URL_HOST );
-	add_submenu_page( 'themes.php', esc_attr__( 'Theme Showcase', 'jetpack-mu-wpcom' ), __( 'Theme Showcase', 'jetpack-mu-wpcom' ), 'read', "https://wordpress.com/themes/$site_slug?ref=wpcom-themes-menu" );
+	add_submenu_page(
+		'themes.php',
+		esc_attr__( 'Theme Showcase', 'jetpack-mu-wpcom' ),
+		__( 'Theme Showcase', 'jetpack-mu-wpcom' ),
+		current_user_can( 'switch_themes' ) ? 'switch_themes' : 'edit_theme_options',
+		"https://wordpress.com/themes/$site_slug?ref=wpcom-themes-menu"
+	);
 }
 add_action( 'admin_menu', 'wpcom_themes_add_theme_showcase_menu' );
+
+/**
+ * Removes actions from the active theme details added by Core to replicate our custom WP.com submenus.
+ *
+ * Core expect the menus to link to WP Admin, but our submenus point to wordpress.com so the actions won't work.
+ *
+ * @see https://github.com/WordPress/wordpress-develop/blob/80096ddf29d3ffa4d5654f5f788df7f598b48756/src/wp-admin/themes.php#L356-L412
+ */
+function wpcom_themes_remove_wpcom_actions() {
+	wp_enqueue_script(
+		'wpcom-theme-actions',
+		plugins_url( 'js/theme-actions.js', __FILE__ ),
+		array(),
+		Jetpack_Mu_Wpcom::PACKAGE_VERSION,
+		array(
+			'strategy'  => 'defer',
+			'in_footer' => true,
+		)
+	);
+}
+add_action( 'load-themes.php', 'wpcom_themes_remove_wpcom_actions' );