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CISA KEV · Known exploitedMedium

CVE-2018-6882

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.

CVSS
6.1
EPSS
25.2%
97.7% percentile
CISA KEV
Listed
Published
2018.03.28
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability25.2%
Technical severityCVSS 6.1

Vulnerability overview

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.

Affected product and versions

Product
Synacor Zimbra Collaboration Suite (ZCS)
Affected versions
< 8.7.0, 8.7.0, 8.8.0, 8.8.1, 8.8.2, 8.8.3, 8.8.4, 8.8.5, 8.8.6
Fixed versions
8.7.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.05.10
  1. 1
    Identify

    Confirm that Synacor Zimbra Collaboration Suite (ZCS) and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
CWE-79
KEV added
2022.04.19
Ransomware use
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