Is CVE-2018-14013 actively exploited?

Yes. KEVIntel tracks CVE-2018-14013 as a known exploited vulnerability. Confidence is high.

What exploitation activity has KEVIntel observed?

KEVIntel has not yet recorded sensor-observed exploitation attempts for CVE-2018-14013. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

Version-level data is not available; KEVIntel tracks Synacor Zimbra Collaboration Suite.

No. CVE-2018-14013 is not currently listed in CISA KEV.

Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2018-14013

Zimbra Collaboration Suite Cross-Site Scripting

Synacor / Zimbra Collaboration Suite

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Severity: CVSS 6.1 · Medium
Confidence: High
Exploit status: Exploited in the wild
EPSS: 7.4%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2018-14013 is an unauthenticated vulnerability affecting Synacor Zimbra Collaboration Suite. Synacor Zimbra Collaboration Suite Collaboration before 8.8.11 has XSS in the AJAX and html web clients.

Is it exploited?

Yes. KEVIntel tracks this CVE as a known exploited vulnerability. Confidence is high.

Who is affected?

Synacor / Zimbra Collaboration Suite.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Synacor Zimbra Collaboration Suite Collaboration before 8.8.11 has XSS in the AJAX and html web clients

Synacor Zimbra Collaboration Suite Collaboration before 8.8.11 has XSS in the AJAX and html web clients.

Published: 29 May 2019
Exploitation Reported: 06 Aug 2026
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: Required

CVE References

packetstormsecurity.com/files/151472/Zimbra-Collaboration-Cross-Site... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/151472/Zimbra-Collaboration-Cros...
seclists.org/fulldisclosure/2019/Feb/3 seclists.org · CVE Record http://seclists.org/fulldisclosure/2019/Feb/3
OSS-Security Mailing List openwall.com · CVE Record http://www.openwall.com/lists/oss-security/2019/01/30/1
securityfocus.com/bid/106787 securityfocus.com · CVE Record http://www.securityfocus.com/bid/106787
wiki.zimbra.com/wiki/Zimbra_Security_Advisories wiki.zimbra.com · CVE Record https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories
bugzilla.zimbra.com/show_bug.cgi bugzilla.zimbra.com · CVE Record https://bugzilla.zimbra.com/show_bug.cgi?id=109018
bugzilla.zimbra.com/show_bug.cgi bugzilla.zimbra.com · CVE Record https://bugzilla.zimbra.com/show_bug.cgi?id=109017

Exploitation evidence

Why KEVIntel 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

The Shadowserver

Recorded 06 Aug 2026

Independent exploitation attestation added to the KEVIntel record.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.

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Source	Added
The Shadowserver First	2026-08-06 00:00 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 25 Apr 2025.

View Nuclei template

Virtual patch status

No KEVIntel 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-2018-14013.yaml	25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.0

6.1 Medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

7.4%

Weaknesses

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') CWE-79

All CVSS Scores

CVSS v3.0 6.1 Medium

CVSS:3.0/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.

Synacor Zimbra Collaboration Suite Collaboration <8.8.11 - Cross-Site Scripting

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

06 Aug 2026
Added to KEVIntel KEV Feed

High-confidence, third-party attested exploitation
12 Jun 2026
Public PoC available

Public proof-of-concept code published
25 Apr 2025
Nuclei template available

Scanner coverage available
29 May 2019
CVE published

Vulnerability disclosed publicly
12 Jul 2018
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.

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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-2018-14013

Free JSON includes basic KEV fields

{
  "cve_id": "CVE-2018-14013",
  "confidence": "High",
  "cvss_score": 6.1,
  "epss_score": 0.07376,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

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