Virgin Media is advising more than 800,000 customers with a specific router to change their password immediately after an investigation found hackers could gain access and steal their personal details. Consumer group Which?

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Found default passwords were just eight characters long and consisted of lowercase letters from an A-Z alphabet with just two letters removed, making them vulnerable to hackers. The discovery was made following a Which? Investigation into smart home devices which found that hackers could access home networks and connected appliances in as little as four days. Ethical security researchers SureCloud gained access to a Virgin Super Hub 2 router, although Virgin Media said the issue also existed with other routers of the same age. A Virgin Media spokesman said: 'The security of our network and of our customers is of paramount importance to us. 'We continually upgrade our systems and equipment to ensure that we meet all current industry standards. 'To the extent that technology allows this to be done, we regularly support our customers through advice and updates and offer them the chance to upgrade to a Hub 3.0 which contains additional security provisions.'

Study tested whether popular smart gadgets and appliances, including wireless cameras, a smart padlock and a children's Bluetooth toy, could stand up to a possible hack. The test found that the Fredi Megapix home CCTV camera system operated over the internet using a default administrator account without a password, and Which? Found thousands of similar cameras available for anyone to watch the live feed over the internet. The watchdog said that 'worse still' a hacker could even pan and tilt the cameras to monitor activity in the house. SureCloud hacked the CloudPets stuffed toy, which allows family and friends to send messages to a child via Bluetooth and made it play its own voice messages.

Said it contacted the manufacturers of eight affected products to alert them to flaws as part of the investigation, with the majority updating their software and security. It did not receive a response from the manufacturers of either Fredi Megapix or CloudPets. Alex Neill, Which? Managing director of home products and services, said: 'There is no denying the huge benefits that smart-home gadgets and devices bring to our daily lives. 'However, as our investigation clearly shows, consumers should be aware that some of these appliances are vulnerable and offer little or no security.

'There are a number of steps people can take to better protect their home, but hackers are growing increasingly more sophisticated. 'Manufacturers need to ensure that any smart product sold is secure by design.'

A team of hackers recently discovered a man-in-the-middle vulnerability in a Samsung smart refrigerator that can be exploited to steal Gmail users' login credentials, this week. Hackers from security company Pen Test Partners discovered the flaw while participating in an Internet of Things (IoT) hacking challenge at the Def Con security conference earlier this month. The smart refrigerator, Samsung model RF28HMELBSR, is designed to integrate the user's Gmail Calendar with its display. Samsung implemented SSL to secure the Gmail integration, but the hackers found that the device does not validate SSL certificates, opening the opportunity for hackers to access the network and monitor activity for the user name and password used to link the refrigerator to Gmail. See also: 'While SSL is in place, the fridge fails to validate the certificate,' Ken Muro, a security researcher at Pen Test Partners, told The Register.

'Hence, hackers who manage to access the network that the fridge is on (perhaps through a de-authentication and fake Wi-Fi access point attack) can Man-In-The-Middle the fridge calendar client and steal Google login credentials from their neighbors, for example.' [ For more on IoT security, see. Get regularly scheduled insights. ] Samsung reportedly told The Register that it is 'investigating into this matter as quickly as possible.' However, the hackers that the man-in-the-middle attack wasn't the only potential vulnerability they have found, so Samsung may have its hands full.