CVE-2023-32678: Zulip vulnerable to insufficient authorization check for edition/deletion of messages and topics in private streams by former subscribers
Zulip is an open-source team collaboration tool with topic-based threading that combines email and chat. Users who used to be subscribed to a private stream and have been removed from it since retain the ability to edit messages/topics, move messages to other streams, and delete messages that they used to have access to, if other relevant organization permissions allow these actions. For example, a user may be able to edit or delete their old messages they posted in such a private stream. An administrator will be able to delete old messages (that they had access to) from the private stream. This issue was fixed in Zulip Server version 7.3.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2023-32678?
CVE-2023-32678 is a vulnerability in Zulip, an open-source team collaboration tool, that allows users who were previously subscribed to a private stream to retain the ability to edit, move, and delete messages/topics even after being removed from the stream.
What is the severity of CVE-2023-32678?
CVE-2023-32678 has a severity rating of medium, with a severity value of 6.5.
How does CVE-2023-32678 affect Zulip?
CVE-2023-32678 affects Zulip versions up to and excluding 7.3.
How can I fix CVE-2023-32678?
To fix CVE-2023-32678, users of Zulip are advised to update to version 7.3 or higher.
Is there any additional information about CVE-2023-32678?
Yes, you can find more information about CVE-2023-32678 in the Zulip Server 7.3 changelog and the associated GitHub security advisory.