Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference

What happened

Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.

Affected versions

Zimbra Collaboration Suite (ZCS): See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

• Review the original advisory and validate affected versions.
• Apply vendor-provided updates or mitigations when available.