On the companion's character sheet they're listed as having 0 charisma, unless there's a way it's completely hidden. It's also right at the start of the game (Drunk legionaries and charmed orc arguments) so I haven't picked up any stat boosting items yet.
Another thing is that on the RPS screen hovering over "charm (3)" or "intimidate (3)" gives me a tool tip saying I'm having 0 bonus from charisma. I definitely, 100% have that point in charisma.
