Description
LDAP filter injection in Zimbra Collaboration Suite 10.1.0 through 10.1.21 allows unauthenticated attackers to alter external LDAP search filters. On domains using search-filter authentication and lazy provisioning, this creates a password oracle for external directory users. Authenticated S/MIME lookups can also return certificates and identity data for unintended directory entries.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Zimbra | Zimbra Collaboration Suite | ≤ 10.1.21 | — |
Advisories 1
- WID-SEC-2026-3977 Synacor Zimbra: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 14, 2026
References
- https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1 third-party-advisory