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Tumblr has just released an important security update for its universal iOS app. In a blog post, the company says that the update addresses an issues that allows passwords to be compromised in certain circumstances. Because of this, Tumblr is also urging anyone who used the vulnerable version of the app to change their password immediately.

We have just released a very important security update for our iPhone and iPad apps addressing an issue that allowed passwords to be compromised in certain circumstances¹. Please download the update now.

If you’ve been using these apps, you should also update your password on Tumblr and anywhere else you may have been using the same password. It’s also good practice to use different passwords across different services by using an app like 1Password or LastPass.

The details of the security flaw are scarce, but it’s never good when a user’s password is accessible by anyone else. You can find the update on the App Store now.