Although this article looks at the image cropping security issue from the position of a whistle-blower, it could just as easily apply to a document you send out to a client or supplier or use internally. For example and image of pay scales across a company where you crop out values you do not want that distribution list to see!
Whistleblowers Take Note: Don’t Trust Cropping Tools (theintercept.com)
Remember just because you cannot see it, does not mean it is gone!
Here is another new potential unintentional data leak issue:
Clive Catton MSc (Cyber Security) – by-line and other articles