Improper input validation in the Vega expression function implementation in OpenSearch Dashboards allows a remote authenticated actor with dashboard write permissions to execute arbitrary JavaScript in the context of other users' browser sessions by saving a crafted Vega visualization. The checkForFunctionProperty validation routine failed to recurse into arrays of objects, allowing a function property nested inside an array to bypass validation.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 3
https://aws.amazon.com/security/security-bulletins/2026-102-aws/
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/2.19.5
ff89ba41-3aa1-4d27-914a-91399e9639e5
https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.6.0
ff89ba41-3aa1-4d27-914a-91399e9639e5