The attack, which took place on Monday, has been reported to the National Cyber Security Centre (NCSC) but has not managed breach any of Labour’s data due to its “robust” security system, the party has said.
Labour has not confirmed which of it platforms were targeted by the Distributed Denial of Service (DDoS) attack but it is thought to be campaigning and election tools potentially containing voter information.
The Labour Connects website, which is described by the party as a direct marketing platform currently remains offline with a message saying it is closed for maintenance.
A DDoS attack causes a website to crash by overwhelming it with too much traffic.
A party spokeswoman said: “We have experienced a sophisticated and large-scale cyber-attack on Labour digital platforms. We took swift action and these attempts failed due to our robust security systems. The integrity of all our platforms was maintained and we are confident that no data breach occurred.
“Our security procedures have slowed down some of our campaign activities, but these were restored this morning and we are back up to full speed. We have reported the matter to the National Cyber Security Centre.”
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cyber attack cyber essentials cyber security DDoS attack Labour Party