Multi-use invitations can grant access to other organizations in Zulip

Zulip is an open-source team collaboration tool with topic-based threading. Zulip Server version 2.0.0 and above are vulnerable to insufficient access control with multi-use invitations. A Zulip Server deployment which hosts multiple organizations is vulnerable to an attack where an invitation created in one organization (potentially as a role with elevated permissions) can be used to join any other organization. This bypasses any restrictions on required domains on users' email addresses, may be used to gain access to organizations which are only accessible by invitation, and may be used to gain access with elevated privileges. This issue has been patched in release 4.10. There are no known workarounds for this issue. ### Patches _Has the problem been patched? What versions should users upgrade to?_ ### Workarounds _Is there a way for users to fix or remediate the vulnerability without upgrading?_ ### References _Are there any links users can visit to find out more?_ ### For more information If you have any questions or comments about this advisory, you can discuss them on the [developer community Zulip server](https://zulip.com/developer-community/), or email the [Zulip security team](mailto:security@zulip.com).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

授权机制不正确

Zulip server 安全漏洞

Zulip server是美国Zulip公司的一款开源的团队聊天应用程序。 Zulip server存在安全漏洞，该漏洞源于。驻留多个组织的zlip Server部署很容易受到攻击，在一个组织中创建的邀请(可能是一个具有较高权限的角色)可以被用来加入任何其他组织。这绕过了对用户电子邮件地址所需域的任何限制，可以用来获得对只有邀请才能访问的组织的访问权。

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