http://www.zdnet.com/article/twitter-flaw-allowed-you-to-tweet-from-any-account/
A Twitter security flaw which went undetected for years allowed attackers to post messages masquerading as any user they chose. A security researcher that goes under the moniker Kedrisch disclosed the flaw on Tuesday, which was present on the microblogging platform until 28 February this year. Discovered in Twitter Ads Studio, a platform for advertisers to upload media and content, the high-severity bug appeared in the service library where users can review media before publishing.
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ORIGINAL SOURCE: ZDNet