I should never use bookmarks, because they are a security risk?

Agreed. It seems pretty unlikely - I think I was just grasping for some kind of sensible meaning behind the bank’s admonition against bookmarks. In reality (and given the other information in the OP), the more likely explanation for their warning about bookmarks is that they are just incompetent.

Nah, I’m thinking one of the cleaning temps found the IT department’s keyboard one night and just peeked under it.

This is why you always write your passwords in a box on your whiteboard with “DON’T ERASE!!!” written in big red letters.

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