Actively exploited in the wild
Synacor Zimbra Collaboration Suite (ZCS) Improper Restriction of XML External Entity Reference
Synacor - Zimbra Collaboration Suite (ZCS) · Listed in the CISA KEV since 2022-01-10. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2019-9670
CriticalCVSS 9.8KEVSummary
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.
Risk Assessment
An attacker could exploit XXE to read local files, perform SSRF attacks, or cause denial of service. The risk is high as it can lead to disclosure of sensitive information.
Recommendation
Update Zimbra Collaboration Suite to version 8.7.11p10 or later. It is also recommended to disable unused Autodiscover features and monitor for unusual XML requests.
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Original NVD description (English source)
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.