Certain users of Twitter (s twtr) platform Tweetdeck were shocked Wednesday morning to see that the app — which works via web, desktop and extensions in Chrome and Firefox — was creating pop-up alerts all by itself. The issue seemed to be affecting those who use the Tweetdeck app in Google Chrome, although mixed reports meant all versions could have been affected:
Twitter confirmed there was a “security issue” on Tweetdeck and offered a fix: All users should log out and log back into the platform to be safe.
However, users complained that simply logging out and logging back in hadn’t fixed the pop-ups.
In light of those new complaints, Twitter later announced that all Tweetdeck services were taken down:
Twitter’s decision to take down Tweetdeck could have been fueled by a new problem that popped up in the interim: high-profile Twitter users like Jeff Jarvis lost control of their accounts and spontaneously retweeted a script that appears to single out the XSS exploit that caused the pop-ups in the first place:
Twitter has since brought Tweetdeck back up, citing a “verified fix.”
This article was updated throughout the morning as the situation changed, including Twitter’s announcements.