The overwhelming presumption when your signature appears on something is that you meant to agree to whatever the document says. Even where we don't think it's true, we presume it in order to be fair to the other parties. Except in specific areas where signers are presumed to be idiots, you would have a heavy burden of proof to show that you didn't mean to agree.
But note that this issue of repudiation doesn't even apply to the example given -- someone releases confidential information based on seeing the boss' signature. It doesn't matter if the boss later proves he didn't sign it.
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