Ok. Apps can have security holes, or they may even exploit the information intentionally.
But a security company publishes a report about security of those apps, saying that more than half of the apps it checked have security problems.
You might think that this is a bit worrisome, and it would be if they provided some details. As they're a security company, they do have incentive to list as many findings they can as security problems. Otherwise people might not find their services worth the money!
A threat assessment of 7 million iOS and Android apps
Come on, guys! This sounds a bit like a program from the past which reported each and every cookie as a privacy problem!