CVE-2026-77811 - Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards

CVE-2026-77811 - Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards

Bulletin ID: 2026-088-AWS
Scope: AWS
Content Type: Important (requires attention)
Publication Date: 08/21/2026 13:00 PM PDT

Amazon OpenSearch Service is a managed service that makes it easy to deploy, operate, and scale OpenSearch clusters. We identified CVE-2026-77811, a stored cross-site scripting issue in the dashboards-observability plugin in OpenSearch Dashboards. Improper input validation in the integrations static file endpoint allows a remote authenticated actor with write permissions to OpenSearch Dashboards saved objects to upload a custom integration containing arbitrary JavaScript. When another user accesses the static file endpoint directly, the script executes in their browser session and can perform actions on their behalf, including making API calls to OpenSearch with their privileges.

OpenSearch Dashboards dashboards-observability plugin (open-source, self-managed):

Amazon OpenSearch Service (AWS Managed):

This issue has been addressed in All Amazon OpenSearch Service (managed) versions and OpenSearch (open source) versions 3.4 and 2.19.6. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.

For OpenSearch (open-source), this issue has been addressed in OpenSearch Dashboards dashboards-observability plugin versions 3.4 and 2.19.6. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.