CVE-2023-32678: Zulip vulnerable to insufficient authorization check for edition/deletion of messages and topics in private streams by former subscribers
First published: Fri Aug 25 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Zulip Server | <7.3 |
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Reference Links
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.
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