
personally we know friends that are very sensitive about privacy to the points that family privacy such as photo means alot to them
To this , a Bug with FB Photo API has granted a 3rd party app access to your photo which it shouldn't have under normal circumstances.
In this case , the permission may allow them to share photo in Facebook marketplace or Stories
It is reportedly impacting 6.8 million people , up to 1,500 Apps from more than 800 Developers
To Find out More if you are affected , simply go to https://facebook.com/help/200632800873098?ref=photonotice
and read the instruction shared