What is CVE-2018-3831?

CVE-2018-3831 is a high-severity vulnerability in Elastic Elasticsearch, classified under Information Disclosure. CVSS score: 8.8/10. Published 2018-09-19.

How severe is CVE-2018-3831?

High severity. CVSS v3 base score is 8.8 out of 10.

Information disclosure in Elastic Elasticsearch

CVE-2018-3831

Elasticsearch Alerting and Monitoring in versions before 6.4.1 or 5.6.12 have an information disclosure issue when secrets are configured via the API. The Elasticsearch _cluster/settings API, when queried, could leak sensitive configuration information such as passwords, tokens, or usernames. This could allow an authenticated Elasticsearch user to improperly view these details.

Vulnerability class: Information Disclosure

Published 2018-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (79.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Elastic Elasticsearch — versions before 5.6.12 and 6.4.1

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

discuss.elastic.co/t/elastic-stack-6-4-1-and-5-6-12-security-update/149035 (Mitigation, Vendor Advisory)
www.elastic.co/community/security (Vendor Advisory)

Frequently asked questions

What is CVE-2018-3831?: CVE-2018-3831 is a high-severity vulnerability in Elastic Elasticsearch, classified under Information Disclosure. CVSS score: 8.8/10. Published 2018-09-19.
How severe is CVE-2018-3831?: High severity. CVSS v3 base score is 8.8 out of 10.