pixiv: CSRF at https://chatstory.pixiv.net/imported

Summary: A CSRF in https://chatstory.pixiv.net/imported can trick users to import a novel of the attacker as the users' chatstory. Steps To Reproduce: 1. Attacker creates a novel 2. Go to the novel https://www.pixiv.net/novel/show.php?id=10997105 Import the novel as chatstory by clicking the...