UpHeron
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Servers and applications

CVE-2018-6882

Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1 and 8.8.x before 8.8.7 might allow remote attackers to inject arbitrary web script or HTML via a Content-Location header in an email attachment.

Actively exploited: CISA added it to its Known Exploited Vulnerabilities catalog on 19 Apr 2022.

Severity
Medium 6.1
Published
27 Mar 2018
Last changed
1 Oct 2026
Added to UpHeron
1 Nov 2026
Fixed in
8.7.0
Exploit chance
30% in the next 30 daysHigher than 98% 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 8.8.6
  • Version 8.8.5
  • Version 8.8.4
  • Version 8.8.3
All 9 release lines
  • Every version before 8.7.0
  • Version 8.7.0
  • Version 8.8.0
  • Version 8.8.1
  • Version 8.8.2
  • Version 8.8.3
  • Version 8.8.4
  • Version 8.8.5
  • Version 8.8.6

Known exploited

CISA name
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
Required action
Apply updates per vendor instructions.
Due for US agencies
10 May 2022
Used in ransomware
Yes, known

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2018-6882
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2018-6882