TweetDeck came back online Wednesday afternoon after it was shut down in the morning after a security hack.
We've verified our security fix and have turned TweetDeck services back on for all users. Sorry for any inconvenience.— TweetDeck (@TweetDeck) June 11, 2014
A "cross-site scripting" (XSS) vulnerability left had users accounts open to hijacking, the Guardian reports.
For some TweetDeck users, this meant their Twitter profiles starting auto-retweeting other accounts' posts.
At first, TweetDeck tweeted from its account that the problem had been fixed and users just needed to log back in:
A security issue that affected TweetDeck this morning has been fixed. Please log out of TweetDeck and log back in to fully apply the fix.— TweetDeck (@TweetDeck) June 11, 2014
But shortly after, the account tweeted that it was shutting down the service until further notice.
We've temporarily taken TweetDeck services down to assess today's earlier security issue. We'll update when services are back up.— TweetDeck (@TweetDeck) June 11, 2014
Twitter.com and other third-party clients did not appear to affected by the issue.