What it is
CVE-2018-6882 is an unauthenticated vulnerability affecting Zimbra Collaboration Suite. Cross-site scripting (XSS) vulnerability in the ZmMailMsgView.getAttachmentLinkHtml function in Zimbra Collaboration Suite (ZCS)...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2018-6882
Collaboration Suite Cross-Site Scripting
Zimbra / Collaboration Suite
- Severity
- CVSS 6.1 · Medium
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 25.4%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Zimbra / Collaboration Suite.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Collaboration Suite Cross-Site Scripting
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.
- Published
- 27 Mar 2018
- Exploitation Reported
- 19 Apr 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
Tags
ransomware
malware
cisa
nuclei_scanner
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2018-6882
- 20180324 Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links seclists.org · Mailing List http://seclists.org/fulldisclosure/2018/Mar/52
- 20180324 Cross-Site Scripting vulnerability in Zimbra Collaboration Suite due to the way it handles attachment links securityfocus.com · Mailing List http://www.securityfocus.com/archive/1/541891/100/0/threaded
- securify.nl/advisory/SFY20180101/cross-site-scripting-vu... securify.nl · CVE Record https://www.securify.nl/advisory/SFY20180101/cross-site-scripting-vul...
- wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7 wiki.zimbra.com · CVE Record https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.7
- bugzilla.zimbra.com/show_bug.cgi bugzilla.zimbra.com · CVE Record https://bugzilla.zimbra.com/show_bug.cgi?id=108786
- wiki.zimbra.com/wiki/Zimbra_Security_Advisories wiki.zimbra.com · CVE Record https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Used in malware
CISA
Malware families have been linked to exploitation of this CVE.
Proof of concept available
Nuclei Templates
Public scanner or PoC coverage increases practical exploitability.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-04-19 00:00 UTC |
| CVE | 2026-08-13 04:20 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nuclei template detected 01 Jun 2026.
View Nuclei template (opens in new tab)Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nuclei | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2018/CVE-2018-6882.yaml | 01 Jun 2026 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
6.1
Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
25.4%
All CVSS Scores
CVSS v3.1
6.1
Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v2.0
4.3
Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
Zimbra Collaboration Suite - Cross-site Scripting
nuclei · Created Unknown
Timeline
From disclosure to observed exploitation
-
KEV confirmed by CVE
Exploitation attested by an external source
-
Public PoC available
Public proof-of-concept code published
-
Nuclei template available
Scanner coverage available
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
First public exploitation report
Exploit observed in malware
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2018-6882
Free JSON includes basic KEV fields{
"cve_id": "CVE-2018-6882",
"confidence": "Confirmed",
"cvss_score": 6.1,
"cvss_estimated": false,
"epss_score": 0.2542,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.