An LDAP filter injection vulnerability in Zimbra Collaboration Suite (ZCS) allows an authenticated user to query otherwise unreturned attributes of calendar resources through SearchCalendarResourcesRequest. Zimbra escapes search values but inserts the supplied attribute names directly into LDAP filter expressions without validation. An attacker can inject additional conditions and use repeated matching queries to recover readable resource attributes such as internal mailbox hostnames and mail transport routes. The search remains restricted to calendar-resource objects and the LDAP service account's access rights. ZCS 10.1.16 and 10.1.21 are affected.
References
| Link | Resource |
|---|---|
| https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories | Vendor Advisory |
| https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/ | Exploit Third Party Advisory |
Configurations
History
28 Oct 2026, 21:15
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:* | |
| References | () https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories - Vendor Advisory | |
| References | () https://www.rapid7.com/blog/post/ve-breaking-zimbra-identity-boundaries-part-1/ - Exploit, Third Party Advisory | |
| First Time |
Synacor zimbra Collaboration Suite
Synacor |
23 Oct 2026, 14:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-23 14:17
Updated : 2026-10-28 21:15
NVD link : CVE-2026-93636
Mitre link : CVE-2026-93636
CVE.ORG link : CVE-2026-93636
JSON object : View
Products Affected
synacor
- zimbra_collaboration_suite
CWE
CWE-90
Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')