Latitude Financial says a hack of its systems detected last week was worse than it originally thought.

The consumer finance company said on Wednesday its review had “uncovered further evidence of large-scale information theft affecting customers (past and present) and applicants across Australia and New Zealand.”

Its teams were “working urgently” to identify the total number of customers and applicants affected and the type of personal information that was stolen, Latitude said.

It had previously estimated that 330,000 customers and applicants had been affected by the cybercrime, with 96 per cent having a copy of their driver licence or their driver licence number stolen. Around four per cent had their passport data stolen and less than one per cent had Medicare numbers taken.

Latitude shares resumed trading on Wednesday for the first time since the hack. At 11.48am AEDT they were down 9.8 per cent to a nine-month low of $1.0875.

– AAP