This page outlines the security vulnerabilities that have been identified and resolved in the app.
https://k15t.jira.com/issues/?jql=project+%3D+EXP+AND+issuetype+%3D+%22Security+Advisory%22+AND+status+in+%28Released%2C+%22Released+to+Cloud%22%2C+%22Waiting+for+Release%22%29+AND+component+%3D+PDF+ORDER+BY+created+DESC++++