diff --git a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/Sanitizer.java b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/Sanitizer.java
index d0c2e73539..3dd5451cf2 100644
--- a/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/Sanitizer.java
+++ b/spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/Sanitizer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,7 +50,8 @@ public class Sanitizer {
 	private static final Set<String> URI_USERINFO_KEYS = new LinkedHashSet<>(
 			Arrays.asList("uri", "uris", "address", "addresses"));
 
-	private static final Pattern URI_USERINFO_PATTERN = Pattern.compile("\\[?[A-Za-z]+://.+:(.*)@.+$");
+	private static final Pattern URI_USERINFO_PATTERN = Pattern
+			.compile("^\\[?[A-Za-z][A-Za-z0-9\\+\\.\\-]+://.+:(.*)@.+$");
 
 	private Pattern[] keysToSanitize;
 
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/SanitizerTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/SanitizerTests.java
index 0a8f0b22cf..10bc768747 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/SanitizerTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/SanitizerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,6 +56,14 @@ class SanitizerTests {
 				.isEqualTo("http://user:******@localhost:8080");
 	}
 
+	@ParameterizedTest(name = "key = {0}")
+	@MethodSource("matchingUriUserInfoKeys")
+	void uriWithNonAlphaSchemeCharactersAndSingleValueWithPasswordShouldBeSanitized(String key) {
+		Sanitizer sanitizer = new Sanitizer();
+		assertThat(sanitizer.sanitize(key, "s-ch3m.+-e://user:password@localhost:8080"))
+				.isEqualTo("s-ch3m.+-e://user:******@localhost:8080");
+	}
+
 	@ParameterizedTest(name = "key = {0}")
 	@MethodSource("matchingUriUserInfoKeys")
 	void uriWithSingleValueWithNoPasswordShouldNotBeSanitized(String key) {