Other than for medical records, the fact is that there are very few rules requiring employers to keep personnel records of this nature confidential. However, as part of the application, there may be such a requirement. You'll need to check it. If you have already been hired, then see if this disemination violates company policy or the terms of any appliable union agreemnt or employment contract. Also, if disclosing this information to another employee was done as the result of some sort of legal discrimination, then you may have a claim.