Froxlor versions before 2.3.13 expose the raw PEM TLS private key content in JSON API responses for certificate-related commands. This occurs because the ssl_key_file column is returned verbatim without filtering, allowing low-privileged authenticated API users to access private keys of their own domains. Reseller and admin accounts with broader privileges can access private keys of other users. Exposure of these private keys can lead to domain impersonation, passive decryption of TLS traffic, and man-in-the-middle attacks.