diff --git a/app/utility/base_world.py b/app/utility/base_world.py
index 5fe028aa7..acdf6cc58 100644
--- a/app/utility/base_world.py
+++ b/app/utility/base_world.py
@@ -125,7 +125,7 @@ def is_base64(s):
 
     @staticmethod
     def is_uuid4(s):
-        if BaseWorld.re_base64.match(s):
+        if BaseWorld.re_base64.fullmatch(s):
             return True
         return False
 
diff --git a/tests/utility/test_base_world.py b/tests/utility/test_base_world.py
index e9ecc0307..00d599e10 100644
--- a/tests/utility/test_base_world.py
+++ b/tests/utility/test_base_world.py
@@ -91,3 +91,12 @@ def test_is_not_base64(self):
     def test_is_base64(self):
         b64str = 'aGVsbG8gd29ybGQgZnJvbSB1bml0IHRlc3QgbGFuZAo='
         assert BaseWorld.is_base64(b64str)
+
+    def test_is_uuid4(self):
+        assert BaseWorld.is_uuid4('a3f1c2d4-5b6e-4f7a-8c9d-0e1f2a3b4c5d')
+
+    def test_is_not_uuid4(self):
+        assert not BaseWorld.is_uuid4('not a uuid')
+
+    def test_is_not_uuid4_with_trailing_characters(self):
+        assert not BaseWorld.is_uuid4('a3f1c2d4-5b6e-4f7a-8c9d-0e1f2a3b4c5d-extra')