Enumeration of subscribed users and unauthenticated email unsubscriptions on https://newsletter.nextcloud.com/?p=unsubscribe
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The mentioned URL contains a form that, when supplied correct user emails, unsubscribes users from the newsletters they're subscribed to. If the user is not subscribed, the form returns a message that says that the user is not subscribed if this is the case.
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阅读 HackerOne 原文 ↗作者 @strukt · 版权归作者与 Nextcloud 所有