If you have an Apple device (likely to be iPhone, iPad Pro, iPad Air or iPad Mini but please do check all your devices), you will be able to install a security fix that Apple says has been exploited by some, to infiltrate the engine that powers the Safari web browser.
I hope that checking for updates, or installing them automatically, is a part of your cyber security procedures.
But this one is especially important, so do check and follow the instructions. It took less than 5 minutes on my iPad Mini using the ‘Settings | Software Update’ menu.