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Review Board 4.0.12 Release Notes

Release date: March 7, 2023


Review Board 4.0.12 is compatible with Python 2.7 and 3.6-3.10.

Follow our installation guide to prepare your system for Review Board or to upgrade your existing install.

To install this release, run:

$ pip install ReviewBoard==4.0.12

To learn more, see:


A security bug was found that enables a user to log in as another user when LDAP is configured and all the following criteria are met:

  1. You’re using an LDAP server with a security bug that considers a password with an empty user DN to be valid credentials.

    This is unusual and against the LDAP standard. It’s been found in an old version of Active Directory when directly using LDAP, and in decades-old versions of OpenLDAP in specific configurations.

  2. The LDAP server has anonymous binds enabled.

    This allows completely unauthenticated access to the LDAP directory and, along with the first issue, triggers the flawed behavior in Review Board.

  3. The target user to log in as exists in the local Review Board database but not in LDAP.

    Users can only log into local-only accounts, not others in LDAP. In most LDAP-based setups, the only local user created is the default Review Board admin user, which is protected so long as there’s also an admin user in LDAP.

Most users should never hit this issue, as it’s fully dependent on an insecure LDAP server implementation. Modern versions of OpenLDAP, Active Directory, and other popular servers are not susceptible to this bug. If you use Active Directory with Review Board’s “Active Directory” backend, you will not encounter this bug.

This issue affects Review Board because an LDAP server with this security bug results in a “valid credentials” code path in Review Board when trying to log in as a user that doesn’t exist in LDAP.

We’ve tightened the code path and added additional checks to ensure this will no longer happen. The fix is present in Review Board 5.0.3, 4.0.12, and 3.0.25.

We recommend also upgrading your LDAP server to ensure you have all the latest security fixes, and disable anonymous binds if you don’t need them.

If you have any questions or concerns, contact Review Board Support.


  • Christian Hammond

  • David Trowbridge

  • Michelle Aubin