Language: Python
Label: vulnerable
CWE: CWE-347 \u2014 Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Code:
def confirm_sns_subscription(notification):
    logger.info(
        'Received subscription confirmation: TopicArn: %s',
        notification.get('TopicArn'),
        extra={
            'notification': notification,
        },
    )

    # Get the subscribe url and hit the url to confirm the subscription.
    subscribe_url = notification.get('SubscribeURL')
    try:
        urlopen(subscribe_url).read()
    except URLError as e:
        # Some kind of error occurred when confirming the request.
        logger.error(
            'Could not confirm subscription: "%s"', e,
            extra={
                'notification': notification,
            },
            exc_info=True,
        )