What is CVE-2026-77811?

CVE-2026-77811 is a high-severity vulnerability in Opensearch Dashboards Dashboards-Observability Plugin, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-08-21.

How severe is CVE-2026-77811?

High severity. CVSS v3 base score is 8.7 out of 10.

XSS in Opensearch Dashboards Dashboards-Observability Plugin

CVE-2026-77811

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N.

Affected products

Opensearch Dashboards Dashboards-observability Plugin

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (patch)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (vendor-advisory)
ff89ba41-3aa1-4d27-914a-91399e9639e5 (third-party-advisory)

Frequently asked questions

What is CVE-2026-77811?: CVE-2026-77811 is a high-severity vulnerability in Opensearch Dashboards Dashboards-Observability Plugin, classified under Cross-site Scripting. CVSS score: 8.7/10. Published 2026-08-21.
How severe is CVE-2026-77811?: High severity. CVSS v3 base score is 8.7 out of 10.