CVE-2018-6882: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

CVE-2018-6882 · Severity: critical · CVSS 6.1 · Exploited in the wild · Published 2022-04-19

A cross-site scripting (XSS) vulnerability exists in the ZmMailMsgView.getAttachmentLinkHtml function of Zimbra Collaboration Suite. Remote attackers can inject arbitrary web script or HTML via a malicious Content-Location header in an email attachment.

Technologies: Synacor Zimbra Collaboration Suite (ZCS). Vendors: Synacor.

Quick answers

Is CVE-2018-6882 exploited in the wild?
Yes. CVE-2018-6882 is known to be exploited in the wild, first recorded on 19 April 2022. Treat it as urgent.
How severe is CVE-2018-6882?
Critical severity, with a CVSS score of 6.1, published 19 April 2022.
Which products and versions are affected?
Synacor Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1, 8.8.x before 8.8.7.
Is there a fix for CVE-2018-6882?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2018-6882 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2018-6882?
Check whether you run Synacor Zimbra Collaboration Suite (ZCS). Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • Synacor Zimbra Collaboration Suite (ZCS) before 8.7 Patch 1, 8.8.x before 8.8.7

Timeline

  • 2018-03-20: disclosed: Initial public disclosure via Securify advisory and mailing lists.
  • 2022-04-19: kev added: Added to CISA's Known Exploited Vulnerabilities (KEV) Catalog.

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