CVE-2026-19311: Missing Authorization in Execute Monitor API in OpenSearch Alerting Plugin

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-12 · updated 2026-08-13
Weakness: CWE-475

Description

Missing authorization in the Execute Monitor API in Amazon OpenSearch Alerting plugin might allow an authenticated remote user to read, modify, or delete arbitrary index data via a crafted inline monitor request with unintentional data source and input index parameters.

Affected products

AWS Opensearch: from 2.4 through 3.5
Github Opensearch: from 2.4.0 through 2.19.5; from 3.0.0 through 3.7.0

References

https://aws.amazon.com/about-aws/whats-new/2026/03/amazon-opensearch-service-version-3-5/
https://aws.amazon.com/security/security-bulletins/2026-078-aws/
https://github.com/opensearch-project/alerting/security/advisories/GHSA-xxpg-q3wh-685q

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