diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/PropertiesMongoConnectionDetails.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/PropertiesMongoConnectionDetails.java
index 74a91c9a1c..218ce0928b 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/PropertiesMongoConnectionDetails.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/PropertiesMongoConnectionDetails.java
@@ -16,6 +16,8 @@
 
 package org.springframework.boot.autoconfigure.mongo;
 
+import java.net.URLEncoder;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -46,10 +48,10 @@ public class PropertiesMongoConnectionDetails implements MongoConnectionDetails
 		}
 		StringBuilder builder = new StringBuilder("mongodb://");
 		if (this.properties.getUsername() != null) {
-			builder.append(this.properties.getUsername());
+			builder.append(encode(this.properties.getUsername()));
 			builder.append(":");
 			if (this.properties.getPassword() != null) {
-				builder.append(this.properties.getPassword());
+				builder.append(encode(this.properties.getPassword()));
 			}
 			builder.append("@");
 		}
@@ -71,6 +73,14 @@ public class PropertiesMongoConnectionDetails implements MongoConnectionDetails
 		return new ConnectionString(builder.toString());
 	}
 
+	private String encode(String input) {
+		return URLEncoder.encode(input, StandardCharsets.UTF_8);
+	}
+
+	private char[] encode(char[] input) {
+		return URLEncoder.encode(new String(input), StandardCharsets.UTF_8).toCharArray();
+	}
+
 	@Override
 	public GridFs getGridFs() {
 		return GridFs.of(PropertiesMongoConnectionDetails.this.properties.getGridfs().getDatabase(),
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
index 342461ffc4..13b0e16753 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
@@ -154,6 +154,18 @@ class MongoAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void configuresCredentialsFromPropertiesWithSpecialCharacters() {
+		this.contextRunner
+			.withPropertyValues("spring.data.mongodb.username=us:er", "spring.data.mongodb.password=sec@ret")
+			.run((context) -> {
+				MongoCredential credential = getSettings(context).getCredential();
+				assertThat(credential.getUserName()).isEqualTo("us:er");
+				assertThat(credential.getPassword()).isEqualTo("sec@ret".toCharArray());
+				assertThat(credential.getSource()).isEqualTo("test");
+			});
+	}
+
 	@Test
 	void doesNotConfigureCredentialsWithoutUsernameInUri() {
 		this.contextRunner.withPropertyValues("spring.data.mongodb.uri=mongodb://localhost/mydb?authSource=authdb")