Apple's most recent Mac OS X security update was not made available to users running OS X 10.5 or older.

"Older versions of the operating system, such as Tiger and Leopard, have been left unpatched from the vulnerabilities that could potentially lead to a man-in-the-middle attack, whereby an intruder can intercept credentials or other sensitive data," writes ZDNet UK's Ben Woods.

"It is the first time that the company has not issued core security updates to the Leopard and Tiger versions of the OS, leaving a question mark over whether it will deliver other security updates for the platforms in the future," Woods writes.

Go to "Apple skips security update for pre-Snow Leopard Macs" to read the details.

For regular security news updates, follow eSecurityPlanet on Twitter: @eSecurityP.