Vulnerability · Published Aug 21, 2026 · Assigned by AMZN
CVE-2026-77811Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards
High 8.7
In plain English
A high-severity cross-site scripting in Amazon OpenSearch Service from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).
Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.5%top 55.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| AWS | Amazon OpenSearch Service | see references |
| OpenSearch | OpenSearch Dashboards dashboards-observability plugin | 0 – before 3.40 – before 2.19.6 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
References
- https://opensearch.org/artifacts/by-version/#release-3-4-0 patch
- https://opensearch.org/artifacts/by-version/#release-2-19-6 patch
- https://aws.amazon.com/security/security-bulletins/2026-088-aws/ vendor-advisory
- https://github.com/opensearch-project/dashboards-observability/security/advisories/GHSA-rmqx-r3wm-3px5 third-party-advisory