Enter a template string. The server renders it server-side using Jinja2.
Hint 1: Try 49 — if output is 49, SSTI is confirmed.
Hint 2: Try <Config {'DEBUG': True, 'TESTING': False, 'PROPAGATE_EXCEPTIONS': None, 'SECRET_KEY': None, 'SECRET_KEY_FALLBACKS': None, 'PERMANENT_SESSION_LIFETIME': datetime.timedelta(days=31), 'USE_X_SENDFILE': False, 'TRUSTED_HOSTS': None, 'SERVER_NAME': None, 'APPLICATION_ROOT': '/', 'SESSION_COOKIE_NAME': 'session', 'SESSION_COOKIE_DOMAIN': None, 'SESSION_COOKIE_PATH': None, 'SESSION_COOKIE_HTTPONLY': True, 'SESSION_COOKIE_SECURE': False, 'SESSION_COOKIE_PARTITIONED': False, 'SESSION_COOKIE_SAMESITE': None, 'SESSION_REFRESH_EACH_REQUEST': True, 'MAX_CONTENT_LENGTH': None, 'MAX_FORM_MEMORY_SIZE': 500000, 'MAX_FORM_PARTS': 1000, 'SEND_FILE_MAX_AGE_DEFAULT': None, 'TRAP_BAD_REQUEST_ERRORS': None, 'TRAP_HTTP_EXCEPTIONS': False, 'EXPLAIN_TEMPLATE_LOADING': False, 'PREFERRED_URL_SCHEME': 'http', 'TEMPLATES_AUTO_RELOAD': None, 'MAX_COOKIE_SIZE': 4093, 'PROVIDE_AUTOMATIC_OPTIONS': True}> to read Flask config.
Hint 3: SSTI can lead to RCE — try accessing Python builtins via (<class 'str'>, <class 'object'>)