During the security exploration of Twitter social network as part of  BugBounty-program, I found the vulnerability which allowed hackers to publish entries in Twitter-network by any user of this service, meanwhile without having the access to the account of a victim. This vulnerability was found 26-th February 2017 and was fixed on 28-th February 2017.

http://kedrisec.com/twitter-publish-by-any-user/