CVE-2026-33369: Synacor Zimbra Collaboration Suite

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Zimbra Collaboration (ZCS) 10.0 and 10.1 contains an LDAP injection vulnerability in the Mailbox SOAP service within a FolderAction operation. The application fails to properly sanitize user-supplied input before incorporating it into an LDAP search filter. An authenticated attacker can exploit this issue by sending a crafted SOAP request that manipulates the LDAP query, allowing retrieval of sensitive directory attributes.

Affected products

• Synacor Zimbra Collaboration Suite: from 10.0.0, before 10.1.16 (fixed in 10.1.16)

Published 2026-03-20. Last modified 2026-06-17.