diff --git a/frappe/core/doctype/module_profile/module_profile.py b/frappe/core/doctype/module_profile/module_profile.py
index 374e053683..7a3f4dcdef 100644
--- a/frappe/core/doctype/module_profile/module_profile.py
+++ b/frappe/core/doctype/module_profile/module_profile.py
@@ -55,10 +55,10 @@ class ModuleProfile(Document):
 
 		module_profile_modules = {module.module for module in self.block_modules}
 
-		for user, modules in user_modules.items():
+		for user_name, modules in user_modules.items():
 			if modules != module_profile_modules:
-				user = frappe.get_doc("User", user)
+				user = frappe.get_doc("User", user_name)
 				user.block_modules = []
 				for module in module_profile_modules:
 					user.append("block_modules", {"module": module})
-			user.save()
+				user.save()
diff --git a/frappe/core/doctype/module_profile/test_module_profile.py b/frappe/core/doctype/module_profile/test_module_profile.py
index abfea4af0b..b7c1f0a8d0 100644
--- a/frappe/core/doctype/module_profile/test_module_profile.py
+++ b/frappe/core/doctype/module_profile/test_module_profile.py
@@ -5,6 +5,13 @@ from frappe.tests import IntegrationTestCase
 
 
 class TestModuleProfile(IntegrationTestCase):
+	def setUp(self):
+		# Clean slate before each test
+		frappe.delete_doc_if_exists("Module Profile", "_Test Module Profile", force=1)
+		frappe.delete_doc_if_exists("Module Profile", "_Test Module Profile 2", force=1)
+		frappe.delete_doc_if_exists("User", "test-module-user1@example.com", force=1)
+		frappe.delete_doc_if_exists("User", "test-module-user2@example.com", force=1)
+
 	def test_make_new_module_profile(self):
 		if not frappe.db.get_value("Module Profile", "_Test Module Profile"):
 			frappe.get_doc(
@@ -27,3 +34,134 @@ class TestModuleProfile(IntegrationTestCase):
 		new_user.save()
 
 		self.assertEqual(new_user.block_modules[0].module, "Accounts")
+
+	def test_multiple_block_modules(self):
+		"""Assign multiple blocked modules from profile to user"""
+		module_profile = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile",
+				"block_modules": [{"module": "Accounts"}, {"module": "CRM"}, {"module": "HR"}],
+			}
+		).insert()
+
+		user = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user1@example.com", "first_name": "Test User"}
+		).insert()
+
+		user.module_profile = module_profile.name
+		user.save()
+
+		self.assertSetEqual({bm.module for bm in user.block_modules}, {"Accounts", "CRM", "HR"})
+
+	def test_update_module_profile_propagates_to_users(self):
+		"""Updating block_modules in profile should update linked users"""
+		module_profile = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile",
+				"block_modules": [{"module": "Accounts"}],
+			}
+		).insert()
+
+		user = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user1@example.com", "first_name": "Test User"}
+		).insert()
+
+		user.module_profile = module_profile.name
+		user.save()
+
+		self.assertEqual({bm.module for bm in user.block_modules}, {"Accounts"})
+
+		# Update module profile
+
+		module_profile.append("block_modules", {"module": "Projects"})
+		module_profile.save()
+
+		user.reload()
+		self.assertSetEqual({bm.module for bm in user.block_modules}, {"Accounts", "Projects"})
+
+	def test_clear_block_modules(self):
+		"""Clearing block_modules in profile should also clear them for users"""
+		module_profile = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile",
+				"block_modules": [{"module": "Accounts"}],
+			}
+		).insert()
+
+		user = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user1@example.com", "first_name": "Test User"}
+		).insert()
+
+		user.module_profile = module_profile.name
+		user.save()
+		self.assertTrue(user.block_modules)
+
+		# Clear profile modules
+		module_profile.block_modules = []
+		module_profile.save()
+
+		user.reload()
+		self.assertEqual(user.block_modules, [])
+
+	def test_multiple_users_same_profile(self):
+		"""Updates should propagate to all users linked to the same profile"""
+		module_profile = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile",
+				"block_modules": [{"module": "Accounts"}],
+			}
+		).insert()
+
+		user1 = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user1@example.com", "first_name": "User One"}
+		).insert()
+		user2 = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user2@example.com", "first_name": "User Two"}
+		).insert()
+
+		for u in (user1, user2):
+			u.module_profile = module_profile.name
+			u.save()
+
+		# Update profile
+		module_profile.append("block_modules", {"module": "Projects"})
+		module_profile.save()
+
+		user1.reload()
+		user2.reload()
+		self.assertEqual([bm.module for bm in user1.block_modules], ["Accounts", "Projects"])
+		self.assertEqual([bm.module for bm in user2.block_modules], ["Accounts", "Projects"])
+
+	def test_switch_user_module_profile(self):
+		"""Switching user to a different profile updates their block_modules"""
+		profile1 = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile",
+				"block_modules": [{"module": "Accounts"}],
+			}
+		).insert()
+		profile2 = frappe.get_doc(
+			{
+				"doctype": "Module Profile",
+				"module_profile_name": "_Test Module Profile 2",
+				"block_modules": [{"module": "HR"}],
+			}
+		).insert()
+
+		user = frappe.get_doc(
+			{"doctype": "User", "email": "test-module-user1@example.com", "first_name": "Test User"}
+		).insert()
+
+		user.module_profile = profile1.name
+		user.save()
+		self.assertEqual([bm.module for bm in user.block_modules], ["Accounts"])
+
+		# Switch to another profile
+		user.module_profile = profile2.name
+		user.save()
+		self.assertEqual([bm.module for bm in user.block_modules], ["HR"])