What are the consequences of breaching confidentiality in the workplace?

The consequences of breaching confidentiality in the workplace can include : *Termination - Even if you have an employment contract, it is likely that a breach of confidentiality also constitutes a breach of your employment contract.
In almost all circumstances, an employer will be well within his legal rights to fire you if you breach the employer's confidentiality.
*An employer can also sue an employee for breach of confidentiality, and if successful at trial, the employer can obtain monetary damages from the employee.
*In extreme circumstances, a breach of confidentiality can result in criminal charges against the employee.
A breach of confidentiality may constitute theft of the employer's proprietary information or intellectual property.
*From a long-term perspective, breach of confidentiality can permanently tarnish an employee's reputation.
This is especially true if the employee works in a specialized industry where competing companies know one another well.
Future employers will not look on job applicants favorably if the applicant has breached the confidentiality of a previous employer.

suspension, retraining and possible termination depends on employer.

In short, just from the adjective (Confidential), you may guess that "To be fired" is, at least, what your boss would go ahead directly; and just think of something like breaking the contract agreement by having no "Loyalty" to your employer and so on!