IIRC it was a Webkit vulnerability, so you're ok on this if you're using Firefox. But as the other person said, your whole OS is old and that always comes with some risk.
The main release of Firefox dropped support for El Capitan ages ago, and the last El Capitan-supported version of Firefox ESR stopped receiving security updates in July.
They’d have to update to High Sierra (which is possible on that generation of hardware) to use updated versions of Firefox.
IIRC it was a Webkit vulnerability, so you're ok on this if you're using Firefox. But as the other person said, your whole OS is old and that always comes with some risk.
The main release of Firefox dropped support for El Capitan ages ago, and the last El Capitan-supported version of Firefox ESR stopped receiving security updates in July.
They’d have to update to High Sierra (which is possible on that generation of hardware) to use updated versions of Firefox.