The data that has been leaked outside includes some phone numbers and some emails. The answer to your question is yes, there may be phishing, but again, that's if they are members of a caisse, not if they're clients. If they're clients of Aviso Wealth or of former insurance operations or of life and health insurance, or they're property and casualty clients, they are not impacted.
On July 15th, 2019. See this statement in context.