CVE-2026-18420
RCE via Prototype Pollution in OpenSearch Dashboards
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
Improper input validation in the Time Series Visual Builder (TSVB) plugin in OpenSearch Dashboards allows an authenticated remote user to execute arbitrary code on the server via a crafted JSON payload to the metrics visualization API endpoint. This issue is a form of prototype pollution that enables remote code execution. To remediate this issue, users should upgrade to OpenSearch Dashboards 3.8 or later.
| CWE | CWE-1321 |
| Vendor | aws |
| Product | amazon opensearch service |
| Published | Aug 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
AWS / Amazon OpenSearch Service
3.0.0 < 3.8.0
OpenSearch / OpenSearch Dashboards
3.0.0 < 3.8.0