Trusted servers exchange can be triggered by attacker
访问控制 / 访问控制缺陷（通用） / #1167853
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So this seems to be less bad these days as the trusted servers are no longer enabled by default (however they were some versions ago). The trusted servers exchanged the full user list with another server. As soon as 1 federated share is created between two instances. It is questionable if this is …
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阅读 HackerOne 原文 ↗作者 @rtod · 版权归作者与 Nextcloud 所有