CVE intelligence and bounded remediation

CVE-2019-9670 — Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference

Critical CVSS 9.8 CISA KEV

mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection (XXE) vulnerability, as demonstrated by Autodiscover/Autodiscover.xml.

Severity
Critical
CVSS
9.8 (3.1)
Published
2019-05-29
CISA KEV
Known exploited
Ecosystem
software/application
Weaknesses
CWE-611

Affected products

  • synacor / zimbra_collaboration_suite
  • synacor / zimbra_collaboration_suite / 8.7.11

Showing 2 representative product identities from 11 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

XML external entity and unsafe XML processing

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Inventory XML parsers used by APIs, file imports, office or image formats, identity protocols, feeds, and background jobs.
  • Determine whether document type declarations, external entities, XInclude, schemas, or network resolvers are enabled.
  • Map parser filesystem and network access and the sensitivity of documents it processes.

Remediate safely

  • Configure each parser to reject document type declarations and disable external entity, XInclude, and network resolution features.
  • Prefer a data format or hardened parser that does not support external resolution, and apply input size and depth limits.
  • Update affected XML libraries and centralize secure parser construction so callers cannot silently override it.

Authoritative sources

Complete CVE record and remediation plan

The detailed catalog view below loads this exact record, its source evidence, and the full seven-phase agentic change plan.