CVE-2026-93635: Zimbra Collaboration Suite LDAP Filter Injection via Unescaped computeDn() Template Substitution
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 Software
Event History
Frequently Asked Questions
Which deployments face the most serious unauthenticated impact?
Domains that use both search-filter authentication and lazy provisioning are exposed to a password oracle affecting external directory users. The issue allows an unauthenticated attacker to alter external LDAP search filters.
Is authentication required to obtain unintended directory information through S/MIME lookups?
Yes. The S/MIME lookup impact described requires authentication, and it can return certificates and identity data for unintended directory entries.