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.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
| Link | Tags |
|---|---|
| http://www.securityfocus.com/bid/97159 | vdb entry third party advisory vendor advisory |
| https://groups.google.com/d/msg/zulip-announce/VyawgRuoY34/NTBwnTArGwAJ | release notes third party advisory patch |
| https://github.com/zulip/zulip/commit/7ecda1ac8e26d8fb3725e954b2dc4723dda2255f | third party advisory patch |