Microsoft announced today that its Patch Tuesday updates would include fixes for older versions of Windows, including XP. The move is unusual and mimics a similar one made in the hours following WannaCry s appearance on May 12 when hundreds of thousands of Windows machines worldwide were compromised and their data encrypted. Microsoft had to scramble to release an emergency update late in the evening of May 12 for Windows XP and Windows 8 machines, easing any potential pain for unsupported versions. Microsoft said this is a rare decision and encouraged admins to apply the critical updates.
Source: https://threatpost.com/risk-of-destructive-cyber-attacks-prompts-microsoft-to-update-xp-again/126235/