/usr/share/php/Symfony/Component/Security/Core/Exception/ is in php-symfony-security 2.7.10-0ubuntu2.
This file is owned by root:root, with mode 0o755.
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/usr/share/php/Symfony/Component/Security/Core/Exception/AccessDeniedException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/AccountExpiredException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/AccountStatusException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/AuthenticationCredentialsNotFoundException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/AuthenticationException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/AuthenticationServiceException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/BadCredentialsException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/CookieTheftException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/CredentialsExpiredException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/DisabledException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/ExceptionInterface.php
/usr/share/php/Symfony/Component/Security/Core/Exception/InsufficientAuthenticationException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/InvalidArgumentException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/InvalidCsrfTokenException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/LockedException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/LogoutException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/NonceExpiredException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/ProviderNotFoundException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/RuntimeException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/SessionUnavailableException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/TokenNotFoundException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/UnsupportedUserException.php
/usr/share/php/Symfony/Component/Security/Core/Exception/UsernameNotFoundException.php