Iranian hackers Sadegh Ahmadzadegan and Omid Ghaffarinia have announced the discovery of an exploit in the secure messaging app Telegram that enables a hacker to bypass the minimum and maximum message limitations, and send invisible messages that exceed the app's bandwidth limit, which occasionally results in the app crashing. The hackers posted a video demonstrating the exploit on Amhadzadegan's website.
Source: News.softpedia.com, June 14, 2016.