# CVE-2026-19311

## Summary

- **CVE ID:** CVE-2026-19311
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-475
- **Published:** Aug 12, 2026
- **Last Modified:** Aug 13, 2026

## 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 (2.4)
- Github — OpenSearch (2.4.0)
- Github — OpenSearch (3.0.0)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.41%
- **EPSS Percentile:** 34.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._