Tumblr advises users of its iOS apps to change their passwords . Security hole ` ` for passwords to be compromised in certain circumstances '' Users of Tumblr 's iPhone , iPad apps can download a security fix from App Store .
Tumblr advises users of its iOS apps to update their passwords . Security hole `` allowed passwords to be compromised in certain circumstances '' Users of Tumblr 's iPhone , iPad apps can download a security fix from App Store .