---
id: CVE-2026-93635
title: >-
  LDAP filter injection in Zimbra Collaboration Suite 10.1.0 through 10.1.21
  allows unauthenticated attackers to alter external LDAP search filters
summary: >-
  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 passwo…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-90
vendor: Zimbra
product: Zimbra Collaboration Suite
affected:
  - collaboration_suite <= 10.1.21
published: '2026-10-14'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:55:59.740'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-93635'
references:
  - url: >-
      https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1
    label: cve@rapid7.com
tags:
  - nvd
  - cve.org
epss: 0.00242
epssPercentile: 0.15231
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T15:18:11.514575Z'
ingestedAt: '2026-10-14T17:44:53.680Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.