CVE-2026-77811

High

Description

Improper input validation in the dashboards-observability plugin in OpenSearch Dashboards allows a remote authenticated user with write permissions to OpenSearch Dashboards saved objects to execute arbitrary JavaScript in the context of other users' browser sessions by uploading a saved asset with arbitrary web content.

SeverityHigh

CVSS8.7

Exploit probability—

ProductOpenSearch Dashboards dashboards-observability plugin

PublishedAug 21, 2026

First seenAug 21, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

OpenSearch OpenSearch Dashboards dashboards-observability plugin3.4, 2.19.6 or later

Patches

Vendor advisories

aws.amazon.com/security/security-bulletins/2026-088-aws/

Affected products

Product	Affected versions	Fixed in
OpenSearch OpenSearch Dashboards dashboards-observability plugin	v < 3.4, v < 2.19.6	3.4, 2.19.6

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