Include continue in query string

Closes gh-12665

web/src/main/java/org/springframework/security/web/savedrequest/DefaultSavedRequest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -226,7 +226,8 @@ public class DefaultSavedRequest implements SavedRequest {
 		if (!propertyEquals(this.pathInfo, request.getPathInfo())) {
 			return false;
 		}
-		if (!propertyEquals(this.queryString, request.getQueryString())) {
+		if (!propertyEquals(createQueryString(this.queryString, this.matchingRequestParameterName),
+				request.getQueryString())) {
 			return false;
 		}
 		if (!propertyEquals(this.requestURI, request.getRequestURI())) {

web/src/test/java/org/springframework/security/web/savedrequest/HttpSessionRequestCacheTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -115,6 +115,23 @@ public class HttpSessionRequestCacheTests {
 		cache.setMatchingRequestParameterName("success");
 		cache.saveRequest(request, new MockHttpServletResponse());
 		MockHttpServletRequest requestToMatch = new MockHttpServletRequest();
+		requestToMatch.setQueryString("success"); // gh-12665
+		requestToMatch.setParameter("success", "");
+		requestToMatch.setSession(request.getSession());
+		HttpServletRequest matchingRequest = cache.getMatchingRequest(requestToMatch, new MockHttpServletResponse());
+		assertThat(matchingRequest).isNotNull();
+	}
+
+	// gh-12665
+	@Test
+	public void getMatchingRequestWhenMatchingRequestParameterNameSetAndParameterExistAndQueryThenLookedUp() {
+		MockHttpServletRequest request = new MockHttpServletRequest();
+		request.setQueryString("param=true");
+		HttpSessionRequestCache cache = new HttpSessionRequestCache();
+		cache.setMatchingRequestParameterName("success");
+		cache.saveRequest(request, new MockHttpServletResponse());
+		MockHttpServletRequest requestToMatch = new MockHttpServletRequest();
+		requestToMatch.setQueryString("param=true&success");
 		requestToMatch.setParameter("success", "");
 		requestToMatch.setSession(request.getSession());
 		HttpServletRequest matchingRequest = cache.getMatchingRequest(requestToMatch, new MockHttpServletResponse());