Apple is asking users to refresh their copies of Java Player to the latest build following an update from the company which disables older, vulnerable versions of the platform.
The company said that it would be disabling copies of the Java Web plug-in version 7 update 17 and earlier on OS X Lion and Mountain Lion systems and Java 6 version 43 and earlier on OS X Snow Leopard.
Apple had previously posted patches for both of the Java builds in March and on Thursday the company put into effect protections which would disable the vulnerable versions of both plug-ins on Apple systems.
The company is advising users to update to the latest version of the Java Web plug-in by using the 'Java' control panel on Lion and Mountain Lion systems and the System Update tool on Snow Leopard.
Windows users running Safari will not be subject to the block, but are still encouraged to update their systems to the latest version of Java to avoid malware infections.
Blocking vulnerable versions of Java has become an increasingly-common security procedure for Apple as malware writers have sought to exploit vulnerabilities in OS X systems for malware installations.
In January, worries over attacks on Mac systems moved the company to block vulnerable versions of the Java plug-in as a short-term security precaution.
Cotton seedling freezes to death as Chang'e-4 shuts down for the Moon's 14-day lunar night
Fortnite easily out-earns PUBG, Assassin's Creed Odyssey and Red Dead Redemption 2 in 2018
Meteor showers as a service will be visible for about 100 kilometres in all directions
Saturn's rings only formed in the past 100 million years, suggests analysis of Cassini space probe data
New findings contradict conventional belief that Saturn's rings were formed along with the planet about 4.5 billion years ago