# CVE-2026-93635: Zimbra Collaboration Suite LDAP filter injection

Source: https://junglewise.ai/threats/cve-2026-93635-ldap-filter-injection-in-zimbra-collaboration-suite-10-1-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-93635 · Severity: medium · CVSS 5.3 · Published 2026-10-14

Zimbra Collaboration Suite, a self-hosted email and calendar platform, contains an LDAP filter injection vulnerability that allows attackers without credentials to manipulate directory searches. On systems using external LDAP with search-filter authentication and lazy provisioning, this flaw enables password guessing attacks against directory users and unauthorized retrieval of certificates and identity information for unintended people.

Technologies: [Zimbra Collaboration Suite](https://junglewise.ai/threats/technologies/collaboration). Vendors: [Zimbra](https://junglewise.ai/threats/vendors/zimbra).

## Quick answers

**Is CVE-2026-93635 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-93635 being exploited in the wild.

**How severe is CVE-2026-93635?** Medium severity, with a CVSS score of 5.3, published 14 October 2026.

**Which products and versions are affected?** Zimbra Collaboration Suite 10.1.0 through 10.1.21.

**Is there a fix for CVE-2026-93635?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-93635 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-93635?** Check whether you run Zimbra Collaboration Suite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

LDAP filter injection in the external LDAP search component allows unauthenticated attackers to modify filter logic. The vulnerability affects domains configured with search-filter authentication and lazy provisioning, where it serves as a password oracle; authenticated S/MIME certificate lookups are also affected and can leak directory entries and identity data beyond the intended target. No public fix is currently listed.

## Affected products

- Zimbra Collaboration Suite 10.1.0 through 10.1.21

## Timeline

- 2026-10-14: disclosed

## References

- [https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1](https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1)

## Related threats

- [Zimbra Collaboration Suite local privilege escalation in dnscache](https://junglewise.ai/threats/cve-2026-93640-a-local-privilege-escalation-vulnerability-in-the-optional)
- [Zimbra Collaboration Suite authorization bypass in Zimlet configuration](https://junglewise.ai/threats/cve-2026-93639-a-missing-authorization-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite reflected cross-site scripting in login](https://junglewise.ai/threats/cve-2026-93638-a-reflected-cross-site-scripting-vulnerability-in-the-login-page)
- [Zimbra Collaboration Suite LDAP filter injection](https://junglewise.ai/threats/cve-2026-93636-an-ldap-filter-injection-vulnerability-in-zimbra-collaboration)
- [Zimbra Collaboration Suite cross-account authorization bypass in FileSharedWithMeRequest](https://junglewise.ai/threats/cve-2026-93634-a-cross-account-authorization-vulnerability-in-zimbra)