I have recently released Contact Form 7 2.0.7. This update includes several security fixes, so upgrading quickly is highly recommended.

Changelog

• Add new filter hook (wpcf7_validation_error) and action hooks (wpcf7_admin_after_general_settings, wpcf7_admin_after_form, wpcf7_admin_after_mail, wpcf7_admin_after_mail_2, wpcf7_admin_after_messages, and wpcf7_admin_after_additional_settings)
• Call $captcha->cleanup() if available and shorten cleanup period (in modules/captcha.php)
• Various fixes with administration panels
• Improve DB table check
• Fix bug relating to disappearing backslashes
• Sanitize filenames with multiple extensions (relating to the issue discussed on Ticket #11122)
• Update translation for Persian (props: Mohammad Musavi)