High severity · published Aug 21, 2026
CVE-2026-77811
Stored Cross-Site Scripting via Integration Template Asset in OpenSearch Dashboards
8.7
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OD
OpenSearch Dashboards dashboards-observability plugin · OpenSearch
before 3.4; before 2.19.6 · source: vendor
Affected product
OD
OpenSearch Dashboards dashboards-observability plugin
OpenSearch
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77811
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77811
aws.amazon.com
https://aws.amazon.com/security/security-bulletins/2026-088-aws/
github.com
https://github.com/opensearch-project/dashboards-observability/security/advisories/GHSA-rmqx-r3wm-3px5
opensearch.org
https://opensearch.org/artifacts/by-version/#release-2-19-6
opensearch.org
https://opensearch.org/artifacts/by-version/#release-3-4-0