If so, your website will no longer be supported by Magento after 30 June 2020. There will be no further patches (including important security updates) released. This has some important payment security implications for you.
Your website will be heavily exposed to the serious threat of a cyber-attack which could result in a costly data breach. It also means that you will be non-compliant to the Payment Card Industry Data Security Standards (PCI DSS). You will incur PCI non-compliance fees and card schemes will hold you liable for data breach losses relating to the cards stolen from your business. Additionally, you will be expected to undertake an in-depth forensic investigation.
We can provide you with a complimentary assessment of your website's current security status; this includes a review of your patching position, security setup and it will even help you identify if there's any malware.
We recommend that you take steps to upgrade your website immediately.