Unauthorized Subscription Vulnerability in Zulip Group Chat Application Server

CVE-2017-0881 · MEDIUM Severity

AV:N/AC:L/AU:S/C:P/I:N/A:N

An error in the implementation of an autosubscribe feature in the check_stream_exists route of the Zulip group chat application server before 1.4.3 allowed an authenticated user to subscribe to a private stream that should have required an invitation from an existing member to join. The issue affects all previously released versions of the Zulip server.

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