Cybersecurity company Imperva today disclosed a data breach that impacts certain customers of its Cloud Web Application Firewall (WAF) product who had accounts through Sept. 15, 2017.

The breach exposed email addresses, hashed and salted passwords, and, for a subset of customers, API keys and customer-provided SSL certificates. In a company blog post, Imperva says it first became aware of the incident on Aug. 20. Additional details pertaining to the nature of incident, including the cause and the number of individuals impacted, were not revealed in the announcement.

In response to the incident, the Redwood City, California-based firm says that it has delegated responsibilities to both an internal data security response team and outside forensics experts, and has commenced outright to global regulatory agencies as well as affected customers. It has also forced password rotations and 90-day expirations in the Cloud WAF product.

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