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ExploitedIn CISA KEVFix available

CVE-2018-6882

Exploitation confirmed. First attested on 2022-04-19 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2018-03-27
  • Fixed in8.7.0
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2018-03-2716:29CVE publishedNVD
  2. 2022-04-19Added to the CISA KEV catalogCISA KEV
  3. 2022-04-19Listed as exploited by GCVEGCVE
  4. 2022-04-19Exploitation first reportedCISA KEV
  5. 2026-08-1303:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-6882?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-6882?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Synacor zimbra collaboration suite
BranchAffectedFixed in
8.7< 8.7.08.7.0
8.7= 8.7.0no fix published
8.8= 8.8.0no fix published
8.8= 8.8.1no fix published
8.8= 8.8.2no fix published
8.8= 8.8.3no fix published
8.8= 8.8.4no fix published
8.8= 8.8.5no fix published
8.8= 8.8.6no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Synacor zimbra collaboration suite to 8.7.0
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-05-10

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-04-19
Patch Due Date
2022-05-10
Ransomware Use
Known
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published
2018-03-27
Last Modified
2026-10-01
NVD status
Analyzed
GitHub Advisory
GHSA-3rrv-gxmq-5643

Frequently asked questions

What is 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.

Is CVE-2018-6882 actively exploited?

Yes. CVE-2018-6882 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-05-10.

What is the CVSS score for CVE-2018-6882?

CVE-2018-6882 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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Sources for this record