Ilia Denisov
00a33c227b
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DeleteMessage/EditMessage acted on the message id without checking it belonged to the campaign id in the URL. A mismatched pair could edit an unrelated campaign's message or — worse — delete the default campaign's last message via another campaign's URL, bypassing the "default keeps >=1 message" guard. Both now load the campaign and return ErrNotFound unless it owns the message (MoveMessage already did). Operator-only, but a real business-logic bypass. Regression test: TestBannerMessageOwnership.