Zimbra CS 10.1.010.1.21: LDAP FI - Unauth pwd oracle via search-filter
CVE-2026-93635 Published on October 14, 2026
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.
Vulnerability Analysis
CVE-2026-93635 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
What is a LDAP Injection Vulnerability?
The software constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.
CVE-2026-93635 has been classified to as a LDAP Injection vulnerability or weakness.
Products Associated with CVE-2026-93635
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Affected Versions
Zimbra Collaboration Suite:- Before and including 10.1.21 is affected.