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      <title>CVE-2023-28623 — Unauthorized user can register an account in specific configurations in Zulip</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2023-28623</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zulip&lt;/p&gt;
&lt;p&gt;Zulip is an open-source team collaboration tool with unique topic-based threading. In the event that 1: `ZulipLDAPAuthBackend` and an external authentication backend (any aside of `ZulipLDAPAuthBackend` and `EmailAuthBackend`) are the only ones enabled in `AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py` and 2: The organization permissions don&amp;#39;t require invitations to join. An attacker can create a new account in the organization with an arbitrary email address in their control that&amp;#39;s not in the organization&amp;#39;s LDAP directory. The impact is limited to installations which have this specific combination of authentication backends as described above in addition to having `Invitations are required for joining this organization` organization permission disabled. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may enable the `Invitations are required for joining this organization` organization permission to prevent this issue.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; zulip&lt;/p&gt;
&lt;p&gt;Zulip is an open-source team collaboration tool with unique topic-based threading. In the event that 1: `ZulipLDAPAuthBackend` and an external authentication backend (any aside of `ZulipLDAPAuthBackend` and `EmailAuthBackend`) are the only ones enabled in `AUTHENTICATION_BACKENDS` in `/etc/zulip/settings.py` and 2: The organization permissions don&amp;#39;t require invitations to join. An attacker can create a new account in the organization with an arbitrary email address in their control that&amp;#39;s not in the organization&amp;#39;s LDAP directory. The impact is limited to installations which have this specific combination of authentication backends as described above in addition to having `Invitations are required for joining this organization` organization permission disabled. This issue has been addressed in version 6.2. Users are advised to upgrade. Users unable to upgrade may enable the `Invitations are required for joining this organization` organization permission to prevent this issue.&lt;/p&gt;</content:encoded>
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