mailboxd in Zimbra Collaboration Suite 8.8 before 8.8.8; 8.7 before 8.7.11.Patch3; and 8.6 allows Account Enumeration by leveraging a Discrepancy between the "HTTP 404 - account is not active" and "HTTP 401 - must authenticate" errors.
| Software | From | Fixed in |
|---|---|---|
| synacor / zimbra_collaboration_suite | 8.6.0 | 8.6.0.x |
| synacor / zimbra_collaboration_suite | 8.7.0 | 8.7.11.x |
| synacor / zimbra_collaboration_suite | 8.8 | 8.8.8 |