diff --git a/typo3/sysext/core/Classes/Authentication/AbstractAuthenticationService.php b/typo3/sysext/core/Classes/Authentication/AbstractAuthenticationService.php
index 6c8b0983dcb15f78a101137a0d70b7cb68b8ff0d..c7b928afb95d1e78d4e71698cc6bf4123164df78 100644
--- a/typo3/sysext/core/Classes/Authentication/AbstractAuthenticationService.php
+++ b/typo3/sysext/core/Classes/Authentication/AbstractAuthenticationService.php
@@ -122,7 +122,7 @@ class AbstractAuthenticationService implements LoggerAwareInterface
      * @param string $username User name
      * @param string $extraWhere Additional WHERE clause: " AND ...
      * @param array|string $dbUserSetup User db table definition, or empty string for $this->db_user
-     * @return mixed User array or FALSE
+     * @return array<string, mixed>|false User array or FALSE
      */
     public function fetchUserRecord($username, $extraWhere = '', $dbUserSetup = '')
     {
diff --git a/typo3/sysext/core/Classes/Authentication/AuthenticationService.php b/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
index 49b5508a50d14316a6609f700989839c79b01e70..8073e73bb781da5dac97e5950a6973950d95a9f4 100644
--- a/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
+++ b/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
@@ -52,7 +52,7 @@ class AuthenticationService extends AbstractAuthenticationService implements Mim
     /**
      * Find a user (eg. look up the user record in database when a login is sent)
      *
-     * @return mixed User array or FALSE
+     * @return array<string, mixed>|false User array or FALSE
      */
     public function getUser()
     {
@@ -97,7 +97,7 @@ class AuthenticationService extends AbstractAuthenticationService implements Mim
      *  > 0:    User authenticated successfully. Other auth services will still be asked.
      *  <= 0:   Authentication failed, no more checking needed by other auth services.
      *
-     * @param array $user User data
+     * @param array<string, mixed> $user User data
      * @return int Authentication status code, one of 0, 100, 200
      */
     public function authUser(array $user): int