Scarborough Council has revealed it has sacked a town hall official for leaking a confidential document to "an unauthorised third party."
It has given no more details about the leak.
The authority meets next week to discuss ways of improving security and ensuring that confidential documents that are meant to be seen only by certain councillors are not passed on to others.
The council's legal chief says it has become clear that documents have been occasionally leaked.
In November 2013 a further unauthorised disclosure of confidential legal information which could have jeopardised the council’s position in a commercial law case led to an immediate review of access to confidential reports.
Scarborough Council will be discussing funding for the relocation of residents at Knipe Point today.
The residents are moving after a landslip put their homes dangerously close to the cliff edge.
Four properties are at are at risk of sliding into the sea and are likely to be demolished.
Following bad weather in January, the properties, which are currently unoccupied, are now just a few metres away from the edge of the same active landslide, which four and a half years ago led to the loss of three bungalows.