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Everyone with half a mind for security will tell you not to click on links in emails, but few people can explain exactly why you shouldn’t do that (they will usually offer a canned ‘hackers can steal your credentials if you do’ explanation) Cross-Site Request Forgery (CSRF) is that reason. Clicking on that link means that an attacker can fake any user-supplied input on a site and make it indistinguishable from a user doing it themselves.