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Servers and applications

CVE-2018-20160

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.

Severity
Critical 9.8
Published
29 May 2019
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
8.7.11, 8.8.9
Exploit chance
2.2% in the next 30 daysHigher than 83% of CVEs. EPSS by FIRST, 10 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Zimbra CollaborationServers and applications · cpe:a:synacor:zimbra_collaboration_suite
  • Version 8.8.11
  • Version 8.8.10-p4
  • Version 8.8.10-p3
  • Version 8.8.10-p2
All 25 release lines
  • From 8.7.0 before 8.7.11
  • Version 8.7.11
  • Version 8.7.11-p1
  • Version 8.7.11-p2
  • Version 8.7.11-p3
  • Version 8.7.11-p4
  • Version 8.7.11-p5
  • Version 8.7.11-p6
  • Version 8.7.11-p7
  • Version 8.7.11-p8
  • Version 8.7.11-p9
  • From 8.8.0 before 8.8.9
  • Version 8.8.9
  • Version 8.8.9-p1
  • Version 8.8.9-p2
  • Version 8.8.9-p3
  • Version 8.8.9-p4
  • Version 8.8.9-p6
  • Version 8.8.9-p7
  • Version 8.8.9-p8
  • Version 8.8.10
  • Version 8.8.10-p2
  • Version 8.8.10-p3
  • Version 8.8.10-p4
  • Version 8.8.11

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-20160
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-20160