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zimbra_collaboration_suite

Vendor: synacor

Actively Exploited 17 CISA KEV List
PoC / Exploits 10 Code Available
Total RCEs 6 Remote Access
Total CVEs 443 Total Indexed
Avg. EPSS 19.23% Exploit Prob.
Latest CVE CVE-2026-33373 Mar 30

Security Vulnerability Index

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6.1 CVSS

There is a Persistent XSS vulnerability in the briefcase component of Synacor Zimbra Collaboration Suite (ZCS) Zimbra Web Client (ZWC) 8.8.8 before 8.8.8 Patch 7 and 8.8.9 before 8.8.9 Patch 1.

EPSS: 0.62%
4.8 CVSS

Synacor Zimbra Admin UI in Zimbra Collaboration Suite before 8.8.0 beta 2 has Persistent XSS via mail addrs.

EPSS: 0.22%
5.3 CVSS

An issue was discovered in Synacor Zimbra Collaboration Suite 8.6.x before 8.6.0 Patch 11, 8.7.x before 8.7.11 Patch 6, 8.8.x before 8.8.8 Patch 9, and 8.8.9 before 8.8.9 Patch 3. Account number enumeration is possible via inconsistent responses for specific types of authentication requests.

EPSS: 2.61%
Critical Target
9.8 CVSS
CVE-2019-9670
Exploit Found

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.

EPSS: 94.43%
6.5 CVSS

Zimbra Collaboration Suite 8.7.x through 8.8.11 allows Blind SSRF in the Feed component.

EPSS: 0.26%
9.8 CVSS

Synacor Zimbra Collaboration Suite 8.7.x through 8.8.11 allows insecure object deserialization in the IMAP component.

EPSS: 40.85%
9.8 CVSS

ZxChat (aka ZeXtras Chat), as used for zimbra-chat and zimbra-talk in Synacor Zimbra Collaboration Suite 8.7 and 8.8 and in other products, allows XXE attacks, as demonstrated by a crafted XML request to mailboxd.

EPSS: 1.65%
6.1 CVSS

mailboxd component in Synacor Zimbra Collaboration Suite 8.6, 8.7 before 8.7.11 Patch 7, and 8.8 before 8.8.10 Patch 2 has Persistent XSS.

EPSS: 0.48%
6.1 CVSS

Synacor Zimbra Collaboration Suite Collaboration before 8.8.11 has XSS in the AJAX and html web clients.

EPSS: 18.25%
Critical Target
7.5 CVSS
CVE-2019-9621
Exploit Found

Zimbra Collaboration Suite before 8.6 patch 13, 8.7.x before 8.7.11 patch 10, and 8.8.x before 8.8.10 patch 7 or 8.8.x before 8.8.11 patch 3 allows SSRF via the ProxyServlet component.

EPSS: 94.11%