| Package | Affected versions | Patched versions |
|---|---|---|
| zulip server | < 1.4.3 | 1.4.3 |
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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