diff --git a/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilter.java b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilter.java
index 04a88be9c3..4cb47f575c 100644
--- a/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilter.java
+++ b/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilter.java
@@ -178,9 +178,10 @@ public class OAuth2LoginAuthenticationFilter extends AbstractAuthenticationProce
 				.toUriString();
 		OAuth2AuthorizationResponse authorizationResponse = OAuth2AuthorizationResponseUtils.convert(params, redirectUri);
 
+		Object authenticationDetails = this.authenticationDetailsSource.buildDetails(request);
 		OAuth2LoginAuthenticationToken authenticationRequest = new OAuth2LoginAuthenticationToken(
 				clientRegistration, new OAuth2AuthorizationExchange(authorizationRequest, authorizationResponse));
-		authenticationRequest.setDetails(this.authenticationDetailsSource.buildDetails(request));
+		authenticationRequest.setDetails(authenticationDetails);
 
 		OAuth2LoginAuthenticationToken authenticationResult =
 			(OAuth2LoginAuthenticationToken) this.getAuthenticationManager().authenticate(authenticationRequest);
@@ -189,6 +190,7 @@ public class OAuth2LoginAuthenticationFilter extends AbstractAuthenticationProce
 			authenticationResult.getPrincipal(),
 			authenticationResult.getAuthorities(),
 			authenticationResult.getClientRegistration().getRegistrationId());
+		oauth2Authentication.setDetails(authenticationDetails);
 
 		OAuth2AuthorizedClient authorizedClient = new OAuth2AuthorizedClient(
 			authenticationResult.getClientRegistration(),
diff --git a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilterTests.java b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilterTests.java
index a7c25871f9..8bc1551527 100644
--- a/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilterTests.java
+++ b/oauth2/oauth2-client/src/test/java/org/springframework/security/oauth2/client/web/OAuth2LoginAuthenticationFilterTests.java
@@ -27,6 +27,7 @@ import org.mockito.ArgumentCaptor;
 
 import org.springframework.mock.web.MockHttpServletRequest;
 import org.springframework.mock.web.MockHttpServletResponse;
+import org.springframework.security.authentication.AuthenticationDetailsSource;
 import org.springframework.security.authentication.AuthenticationManager;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.AuthenticationException;
@@ -50,6 +51,7 @@ import org.springframework.security.oauth2.core.endpoint.OAuth2AuthorizationResp
 import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
 import org.springframework.security.oauth2.core.user.OAuth2User;
 import org.springframework.security.web.authentication.AuthenticationFailureHandler;
+import org.springframework.security.web.authentication.WebAuthenticationDetails;
 import org.springframework.security.web.util.UrlUtils;
 import org.springframework.web.util.UriComponentsBuilder;
 
@@ -79,6 +81,7 @@ public class OAuth2LoginAuthenticationFilterTests {
 	private AuthorizationRequestRepository<OAuth2AuthorizationRequest> authorizationRequestRepository;
 	private AuthenticationFailureHandler failureHandler;
 	private AuthenticationManager authenticationManager;
+	private AuthenticationDetailsSource authenticationDetailsSource;
 	private OAuth2LoginAuthenticationToken loginAuthentication;
 	private OAuth2LoginAuthenticationFilter filter;
 
@@ -93,11 +96,13 @@ public class OAuth2LoginAuthenticationFilterTests {
 		this.authorizationRequestRepository = new HttpSessionOAuth2AuthorizationRequestRepository();
 		this.failureHandler = mock(AuthenticationFailureHandler.class);
 		this.authenticationManager = mock(AuthenticationManager.class);
+		this.authenticationDetailsSource = mock(AuthenticationDetailsSource.class);
 		this.filter = spy(new OAuth2LoginAuthenticationFilter(this.clientRegistrationRepository,
 				this.authorizedClientRepository, OAuth2LoginAuthenticationFilter.DEFAULT_FILTER_PROCESSES_URI));
 		this.filter.setAuthorizationRequestRepository(this.authorizationRequestRepository);
 		this.filter.setAuthenticationFailureHandler(this.failureHandler);
 		this.filter.setAuthenticationManager(this.authenticationManager);
+		this.filter.setAuthenticationDetailsSource(this.authenticationDetailsSource);
 	}
 
 	@Test
@@ -400,6 +405,29 @@ public class OAuth2LoginAuthenticationFilterTests {
 		assertThat(authorizationResponse.getRedirectUri()).isEqualTo(expectedRedirectUri);
 	}
 
+	// gh-6866
+	@Test
+	public void attemptAuthenticationShouldSetAuthenticationDetailsOnAuthenticationResult() throws Exception {
+		String requestUri = "/login/oauth2/code/" + this.registration1.getRegistrationId();
+		String state = "state";
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", requestUri);
+		request.setServletPath(requestUri);
+		request.addParameter(OAuth2ParameterNames.CODE, "code");
+		request.addParameter(OAuth2ParameterNames.STATE, state);
+
+		WebAuthenticationDetails webAuthenticationDetails = mock(WebAuthenticationDetails.class);
+		when(authenticationDetailsSource.buildDetails(any())).thenReturn(webAuthenticationDetails);
+
+		MockHttpServletResponse response = new MockHttpServletResponse();
+
+		this.setUpAuthorizationRequest(request, response, this.registration2, state);
+		this.setUpAuthenticationResult(this.registration2);
+
+		Authentication result = this.filter.attemptAuthentication(request, response);
+
+		assertThat(result.getDetails()).isEqualTo(webAuthenticationDetails);
+	}
+
 	private void setUpAuthorizationRequest(HttpServletRequest request, HttpServletResponse response,
 											ClientRegistration registration, String state) {
 		Map<String, Object> attributes = new HashMap<>();