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Vulnerabilities

Vulnerability · CVE-2018-6882

Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability

Published Mar 27, 2018 · catalog updated Oct 1, 2026 · Synacor Zimbra Collaboration Suite (ZCS)

Patch now

CVE-2018-6882 is in the CISA known-exploited catalog, due May 10, 2022. Confirm Synacor Zimbra Collaboration Suite (ZCS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
29.76%
Remediation
Remediation guidance
Affected products
cpe synacor/zimbra collaboration suite · vendor Synacor Zimbra Collaboration Suite (ZCS)

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe synacor/zimbra collaboration suite8.7.0
  • cpe synacor/zimbra collaboration suite8.8.0
  • cpe synacor/zimbra collaboration suite8.8.1
  • cpe synacor/zimbra collaboration suite8.8.2
  • cpe synacor/zimbra collaboration suite8.8.3
  • cpe synacor/zimbra collaboration suite8.8.4
  • cpe synacor/zimbra collaboration suite8.8.5
  • vendor Synacor Zimbra Collaboration Suite (ZCS)version unspecified

How to fix CVE-2018-6882

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2018-6882 is in the CISA known-exploited catalog, due May 10, 2022. Confirm Synacor Zimbra Collaboration Suite (ZCS) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with synacor/zimbra collaboration suite 8.7.0; synacor/zimbra collaboration suite 8.8.0; synacor/zimbra collaboration suite 8.8.1; synacor/zimbra collaboration suite 8.8.2. Apply updates per vendor instructions.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 29.76%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2018 · Catalog

    Detected

    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.

  2. Apr 19, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 10, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Oct 1, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2018-6882

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2018-6882

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2018-6882

    30-day exploitation probability 29.8%

    first.org
  • NIST NVDVulnerability recordCVE-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

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2018-6882

    Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that might allow remote attackers to inject arbitrary web script or HTML.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.