diff --git a/packages/react-native/scripts/cocoapods/__tests__/test_utils/InstallerMock.rb b/packages/react-native/scripts/cocoapods/__tests__/test_utils/InstallerMock.rb
index 9b96f82a22b..6c0bfc7a353 100644
--- a/packages/react-native/scripts/cocoapods/__tests__/test_utils/InstallerMock.rb
+++ b/packages/react-native/scripts/cocoapods/__tests__/test_utils/InstallerMock.rb
@@ -114,14 +114,15 @@ class UserProjectMock
     attr_reader :path
     attr_reader :build_configurations
     attr_reader :native_targets
+    attr_reader :files
 
     attr_reader :save_invocation_count
 
-
-    def initialize(path = "/test/path.xcproj", build_configurations = [], native_targets: [])
-        @path = Pathname.new(path)
+    def initialize(path = "/test/path.xcproj", build_configurations = [], parent = "/test", native_targets: [], files: [])
+        @path = Pathname.new(path, parent)
         @build_configurations = build_configurations
         @native_targets = native_targets
+        @files = files
         @save_invocation_count = 0
     end
 
@@ -130,6 +131,16 @@ class UserProjectMock
     end
 end
 
+class PBXFileRefMock
+    attr_reader :name
+    attr_reader :path
+
+    def initialize(name)
+        @name = name
+        @path = name
+    end
+end
+
 class XCConfigMock
     attr_reader :name
     attr_accessor :attributes
diff --git a/packages/react-native/scripts/cocoapods/__tests__/test_utils/PathnameMock.rb b/packages/react-native/scripts/cocoapods/__tests__/test_utils/PathnameMock.rb
index 19e9a5b282c..883aeea077f 100644
--- a/packages/react-native/scripts/cocoapods/__tests__/test_utils/PathnameMock.rb
+++ b/packages/react-native/scripts/cocoapods/__tests__/test_utils/PathnameMock.rb
@@ -9,8 +9,9 @@ class Pathname
 
     attr_reader :path
 
-    def initialize(path)
+    def initialize(path, parent = "")
         @path = path
+        @parent = parent
     end
 
     def realpath
@@ -21,6 +22,10 @@ class Pathname
         return @path
     end
 
+    def parent
+        return @parent
+    end
+
     def self.pwd!(pwd)
         @@pwd = pwd
     end
diff --git a/packages/react-native/scripts/cocoapods/__tests__/test_utils/XcodeprojMock.rb b/packages/react-native/scripts/cocoapods/__tests__/test_utils/XcodeprojMock.rb
new file mode 100644
index 00000000000..7737a1bba45
--- /dev/null
+++ b/packages/react-native/scripts/cocoapods/__tests__/test_utils/XcodeprojMock.rb
@@ -0,0 +1,21 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+module Xcodeproj
+    class Plist
+        @@path_to_file_mapping = Hash.new
+        def self.read_from_path(path)
+            return @@path_to_file_mapping[path]
+        end
+
+        def self.write_to_path(hash, path)
+            @@path_to_file_mapping[path] = hash
+        end
+
+        def self.reset()
+            @@path_to_file_mapping.clear
+        end
+  end
+end
diff --git a/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb b/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
index 39a74d189a6..1d65edb1f97 100644
--- a/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
+++ b/packages/react-native/scripts/cocoapods/__tests__/utils-test.rb
@@ -14,6 +14,7 @@ require_relative "./test_utils/FileMock.rb"
 require_relative "./test_utils/systemUtils.rb"
 require_relative "./test_utils/PathnameMock.rb"
 require_relative "./test_utils/TargetDefinitionMock.rb"
+require_relative "./test_utils/XcodeprojMock.rb"
 
 class UtilsTests < Test::Unit::TestCase
     def setup
@@ -28,6 +29,7 @@ class UtilsTests < Test::Unit::TestCase
         Pod::Config.reset()
         SysctlChecker.reset()
         Environment.reset()
+        Xcodeproj::Plist.reset()
         ENV['RCT_NEW_ARCH_ENABLED'] = '0'
         ENV['USE_HERMES'] = '1'
         ENV['USE_FRAMEWORKS'] = nil
@@ -772,6 +774,59 @@ class UtilsTests < Test::Unit::TestCase
             assert_equal(config.build_settings["OTHER_CFLAGS"], "$(inherited)")
         end
     end
+
+    # ============================== #
+    # Test - Apply ATS configuration #
+    # ============================== #
+
+    def test_applyATSConfig_plistNil
+        # Arrange
+        user_project_mock = prepare_user_project_mock_with_plists()
+        pods_projects_mock = PodsProjectMock.new([], {"some_pod" => {}})
+        installer = InstallerMock.new(pods_projects_mock, [
+            AggregatedProjectMock.new(user_project_mock)
+        ])
+
+        # # Act
+        ReactNativePodsUtils.apply_ats_config(installer)
+
+        # # Assert
+        assert_equal(user_project_mock.files.length, 2)
+        user_project_mock.files.each do |file|
+            path = File.join(user_project_mock.path.parent, file.name)
+            plist = Xcodeproj::Plist.read_from_path(path)
+            assert_equal(plist['NSAppTransportSecurity'], {
+                'NSAllowsArbitraryLoads' => false,
+                'NSAllowsLocalNetworking' => true,
+            });
+        end
+    end
+
+    def test_applyATSConfig_plistNonNil
+        # Arrange
+        user_project_mock = prepare_user_project_mock_with_plists()
+        pods_projects_mock = PodsProjectMock.new([], {"some_pod" => {}})
+        installer = InstallerMock.new(pods_projects_mock, [
+            AggregatedProjectMock.new(user_project_mock)
+        ])
+        Xcodeproj::Plist.write_to_path({}, "/test/Info.plist")
+        Xcodeproj::Plist.write_to_path({}, "/test/Extension-Info.plist")
+
+        # # Act
+        ReactNativePodsUtils.apply_ats_config(installer)
+
+        # # Assert
+        assert_equal(user_project_mock.files.length, 2)
+        user_project_mock.files.each do |file|
+            path = File.join(user_project_mock.path.parent, file.name)
+            plist = Xcodeproj::Plist.read_from_path(path)
+            assert_equal(plist['NSAppTransportSecurity'], {
+                'NSAllowsArbitraryLoads' => false,
+                'NSAllowsLocalNetworking' => true,
+            });
+        end
+    end
+
 end
 
 # ===== #
@@ -785,6 +840,13 @@ def prepare_empty_user_project_mock
     ])
 end
 
+def prepare_user_project_mock_with_plists
+    return UserProjectMock.new(:files => [
+        PBXFileRefMock.new("Info.plist"),
+        PBXFileRefMock.new("Extension-Info.plist"),
+    ])
+end
+
 def prepare_config(config_name)
     return BuildConfigurationMock.new(config_name, {"LIBRARY_SEARCH_PATHS" => [
         "$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)",