CVE-2019-9670
Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference
Synacor · Zimbra Collaboration Suite (ZCS)
Vulnerability details
Synacor Zimbra Collaboration Suite (ZCS) contains an improper restriction of XML external entity (XXE) vulnerability in the mailboxd component.
Added to CISA KEV: 2022-01-10
Ransomware campaign use: Unknown
CISA due date: 2022-07-10
Defensive guidance from CISA
Apply updates per vendor instructions.
This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.
Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC