CVE-2026-56144: Elastic Elasticsearch

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

Incorrect Authorization (CWE-863) in Elasticsearch can allow an authenticated user with limited index privileges to exploit insufficient authorization controls in the ingest simulation feature. By targeting indices they are not authorized to access directly, the user can cause those indices' configured ingest pipelines to execute and return their output, potentially disclosing data processed or enriched by those pipelines. Additionally, the same feature can be used to retrieve index mapping metadata for indices the user are not authorized to access directly.

Affected products

• Elastic Elasticsearch: from 8.12.0, before 8.19.18 (fixed in 8.19.18); from 9.0.0, before 9.3.7 (fixed in 9.3.7); from 9.4.0, before 9.4.4 (fixed in 9.4.4)

Published 2026-07-21. Last modified 2026-08-26.