LDAP Filter Injection in Zimbra Collaboration Suite Affects Multiple Versions
CVE-2026-93635

5.3MEDIUM

Key Information:

Vendor

Zimbra

Status
Zimbra Collaboration Suite
Vendor
CVE Published:
14 October 2026

What is CVE-2026-93635?

The Zimbra Collaboration Suite versions 10.1.0 through 10.1.21 are susceptible to LDAP filter injection, which enables unauthenticated attackers to manipulate LDAP search filters. This vulnerability primarily affects systems using search-filter authentication combined with lazy provisioning, effectively allowing attackers to exploit a password oracle for users listed in external directories. Furthermore, it may lead to authenticated S/MIME queries returning unintended certificates and identity data for various directory entries, compromising sensitive information and user privacy.

Affected Version(s)

Zimbra Collaboration Suite 0 <= 10.1.21

References

https://www.rapid7.com/blog/post/ve-breaking-zimbra-ident...
third-party-advisory

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jonah Burgess (CryptoCat), Senior Security Researcher, Rapid7
.