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Sage confirmed over the weekend that it had suffered a potenital data breach. It is believed that up to 300 customer accounts may have been accessed without authority, most likely, by a member of staff.
The British accounting software heavyweight called affected customers, informing them that police were in the process of investigating the possible breach. At this stage, it is unclear if any data was stolen, or if it was simply accessed.
A Sage spokesperson said: "We are investigating unauthorised access to customer information using an internal login.
"We cannot comment further whilst we work with the authorities to investigate - but our customers remain our first priority and we are speaking directly with those affected."
Sage in now the only remaining technology stock on the FTSE 100. Shares in the company fell nearly 4% in the first hour of trading this morning, however, have since recovered slightly since.
"We are investigating unauthorised access to customer information using an internal login," the company said in a statement.
"We cannot comment further whilst we work with the authorities to investigate but our customers remain our first priority and we are speaking directly with those affected," it added.
The Information Commissioners Office is also believed to be aiding the investigation, and has the power to bring criminal proceedings, should Sage be found guilty of neglegence.
Sage is on target to see revenues increase by 6% in the current year ending September.