diff --git a/src/main/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerability.java b/src/main/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerability.java
index 45bb82e4..39e1fa10 100644
--- a/src/main/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerability.java
+++ b/src/main/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerability.java
@@ -1,6 +1,8 @@
 package org.sasanlabs.service.vulnerability.sqlInjection;
 
 import java.util.Map;
+import javax.persistence.EntityManager;
+import javax.persistence.PersistenceContext;
 import org.sasanlabs.internal.utility.LevelConstants;
 import org.sasanlabs.internal.utility.Variant;
 import org.sasanlabs.internal.utility.annotations.AttackVector;
@@ -29,6 +31,7 @@
         value = "BlindSQLInjectionVulnerability")
 public class BlindSQLInjectionVulnerability {
 
+    @PersistenceContext private EntityManager entityManager;
     private JdbcTemplate applicationJdbcTemplate;
 
     static final String CAR_IS_PRESENT_RESPONSE = "{ \"isCarPresent\": true}";
@@ -106,4 +109,50 @@ public ResponseEntity<String> getCarInformationLevel3(
                             ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE);
                 });
     }
+
+    // Input Validation - Ensure that the input data is valid and of the expected type.
+    @VulnerableAppRequestMapping(
+            value = LevelConstants.LEVEL_4,
+            variant = Variant.SECURE,
+            htmlTemplate = "LEVEL_1/SQLInjection_Level1")
+    public ResponseEntity<String> getCarInformationLevel4(
+            @RequestParam Map<String, String> queryParams) {
+        String id = queryParams.get(Constants.ID);
+
+        // Validate numeric ID
+        if (!id.matches("\\d+")) {
+            return ResponseEntity.status(HttpStatus.BAD_REQUEST).body("Invalid ID format.");
+        }
+
+        BodyBuilder bodyBuilder = ResponseEntity.status(HttpStatus.OK);
+        bodyBuilder.body(ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE);
+        return applicationJdbcTemplate.query(
+                "select * from cars where id=" + id,
+                (rs) -> {
+                    if (rs.next()) {
+                        return bodyBuilder.body(CAR_IS_PRESENT_RESPONSE);
+                    }
+                    return bodyBuilder.body(
+                            ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE);
+                });
+    }
+
+    // Implementation Level 5 - Hibernate
+    @VulnerableAppRequestMapping(
+            value = LevelConstants.LEVEL_5,
+            variant = Variant.SECURE,
+            htmlTemplate = "LEVEL_1/SQLInjection_Level1")
+    public ResponseEntity<String> getCarInformationLevel5(
+            @RequestParam Map<String, String> queryParams) {
+        int id = Integer.parseInt(queryParams.get(Constants.ID));
+
+        CarInformation car = entityManager.find(CarInformation.class, id);
+
+        if (car != null) {
+            return ResponseEntity.ok(CAR_IS_PRESENT_RESPONSE);
+        } else {
+            return ResponseEntity.status(HttpStatus.NOT_FOUND)
+                    .body(ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE);
+        }
+    }
 }
diff --git a/src/test/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerabilityTest.java b/src/test/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerabilityTest.java
new file mode 100644
index 00000000..fc7759a1
--- /dev/null
+++ b/src/test/java/org/sasanlabs/service/vulnerability/sqlInjection/BlindSQLInjectionVulnerabilityTest.java
@@ -0,0 +1,205 @@
+package org.sasanlabs.service.vulnerability.sqlInjection;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.jdbc.core.JdbcTemplate;
+import org.springframework.jdbc.core.PreparedStatementCreator;
+import org.springframework.jdbc.core.ResultSetExtractor;
+
+public class BlindSQLInjectionVulnerabilityTest {
+
+  @Mock private JdbcTemplate jdbcTemplate;
+
+  @InjectMocks private BlindSQLInjectionVulnerability blindSQLInjectionVulnerability;
+
+  @BeforeEach
+  public void setUp() {
+    MockitoAnnotations.openMocks(this);
+  }
+
+  @Test
+  public void testGetCarInformationLevel1_CarPresent() throws SQLException {
+    // Arrange
+    String id = "1";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // The query is simulated to have returned a result (i.e. there is a car with ID "1")
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(true);
+
+    // return rse.extractData(mockResultSet); indicates that the ResultSetExtractor extracts the
+    // data from the mockResultSet (which mocks the query result)
+    when(jdbcTemplate.query(anyString(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(1);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel1(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals("{ \"isCarPresent\": true}", response.getBody());
+  }
+
+  @Test
+  public void testGetCarInformationLevel1_CarNotPresent() throws SQLException {
+    // Arrange
+    String id = "2";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // The query is simulated to have returned a result (i.e. there is no a car with ID "2")
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(false);
+
+    // return rse.extractData(mockResultSet); indicates that the ResultSetExtractor extracts the
+    // data from the mockResultSet (which mocks the query result)
+    when(jdbcTemplate.query(anyString(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(1);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel1(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals(
+            ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE, response.getBody());
+  }
+
+  @Test
+  public void testGetCarInformationLevel2_CarPresent() throws SQLException {
+    // Arrange
+    String id = "1";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // Mock the ResultSet behavior
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(true);
+
+    // Mock the query method of JdbcTemplate
+    when(jdbcTemplate.query(anyString(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(1);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel2(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals("{ \"isCarPresent\": true}", response.getBody());
+  }
+
+  @Test
+  public void testGetCarInformationLevel2_CarNotPresent() throws SQLException {
+    // Arrange
+    String id = "2";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // Mock the ResultSet behavior
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(false);
+
+    // Mock the query method of JdbcTemplate
+    when(jdbcTemplate.query(anyString(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(1);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel2(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals(
+            ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE, response.getBody());
+  }
+
+  @Test
+  public void testGetCarInformationLevel3_CarPresent() throws SQLException {
+    // Arrange
+    String id = "1";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // Mock the ResultSet behavior
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(true);
+
+    // Mock the query method of JdbcTemplate
+    when(jdbcTemplate.query((PreparedStatementCreator) any(), any(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(2);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel3(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals("{ \"isCarPresent\": true}", response.getBody());
+  }
+
+  @Test
+  public void testGetCarInformationLevel3_CarNotPresent() throws SQLException {
+    // Arrange
+    String id = "2";
+    Map<String, String> queryParams = new HashMap<>();
+    queryParams.put("id", id);
+
+    // Mock the ResultSet behavior
+    ResultSet mockResultSet = mock(ResultSet.class);
+    when(mockResultSet.next()).thenReturn(false);
+
+    // Mock the query method of JdbcTemplate
+    when(jdbcTemplate.query((PreparedStatementCreator) any(), any(), any(ResultSetExtractor.class)))
+            .thenAnswer(
+                    invocation -> {
+                      ResultSetExtractor<ResponseEntity<String>> rse = invocation.getArgument(2);
+                      return rse.extractData(mockResultSet);
+                    });
+
+    // Act
+    ResponseEntity<String> response =
+            blindSQLInjectionVulnerability.getCarInformationLevel3(queryParams);
+
+    // Assert
+    assertEquals(HttpStatus.OK, response.getStatusCode());
+    assertEquals(
+            ErrorBasedSQLInjectionVulnerability.CAR_IS_NOT_PRESENT_RESPONSE, response.getBody());
+  }
+}
+