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MEDIUM severity

CVE-2018-3824 — elasticsearch

MEDIUM

CVE-2018-3824 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in org.elasticsearch:elasticsearch. A fix is available for org.elasticsearch:elasticsearch — see the affected versions and patch details below.

Elasticsearch subject to cross site scripting

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.9%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs59th percentile — riskier than 59% of all scored CVEsHighest risk
0.00%0.46%0.93%1.39%0.2%0.9%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected
☕org.elasticsearch:elasticsearch☕org.elasticsearch:elasticsearch

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

X-Pack Machine Learning versions before 6.2.4 and 5.6.9 had a cross-site scripting (XSS) vulnerability. If an attacker is able to inject data into an index that has a ML job running against it, then when another user views the results of the ML job it could allow the attacker to obtain sensitive information from or perform destructive actions on behalf of that other ML user.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.elasticsearch:elasticsearchall versions5.6.9org.elasticsearch:elasticsearch:5.6.9
☕Mavenorg.elasticsearch:elasticsearch≥ 6.0.0&&< 6.2.46.2.4org.elasticsearch:elasticsearch:6.2.4

Affected Products

3 products · 6 configurations
Application
elasticsearch x-packelastic
≥ 6.0.0 && < 6.2.4
range
Application
kibana x-packelastic
≥ 6.0.0 && < 6.2.4
range
Application
logstash x-packelastic
≥ 6.1.0 && < 6.2.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.elasticsearch:elasticsearch, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.elasticsearch:elasticsearch to 5.6.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-3824 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

X-Pack Machine Learning versions before 6.2.4 and 5.6.9 had a cross-site scripting (XSS) vulnerability. If an attacker is able to inject data into an index that has a ML job running against it, then when another user views the results of the ML job it could allow the attacker to obtain sensitive information from or perform destructive actions on behalf of that other ML user.
O3 Security · Impact-Aware SCA

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CVE-2018-3824: elasticsearch XSS — Fixed in 5.6.9