diff --git a/core/src/main/java/org/apache/struts2/interceptor/parameter/ParametersInterceptor.java b/core/src/main/java/org/apache/struts2/interceptor/parameter/ParametersInterceptor.java
index 08c956f21..f1651cd86 100644
--- a/core/src/main/java/org/apache/struts2/interceptor/parameter/ParametersInterceptor.java
+++ b/core/src/main/java/org/apache/struts2/interceptor/parameter/ParametersInterceptor.java
@@ -219,6 +219,10 @@ public class ParametersInterceptor extends MethodFilterInterceptor {
         Map<String, Parameter> acceptableParameters;
         ValueStack newStack;
         try {
+            if (!threadAllowlist.getAllowlist().isEmpty()) {
+                LOG.error("Thread allowlist was utilised but not cleared", new IllegalStateException());
+                threadAllowlist.clearAllowlist();
+            }
             acceptableParameters = toAcceptableParameters(parameters, action); // Side-effect: Allowlist required types
 
             newStack = toNewStack(stack);