CVE-2026-18420RCE via Prototype Pollution in OpenSearch Dashboards
Updated under an hour ago ()
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It affects AWS Amazon OpenSearch Service and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- AMZN
- NVD analysis
- Awaiting Analysis
- Record last updated
- Aug 25, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
AWS Amazon OpenSearch Service aws:amazon_opensearch_service (from the name) | from 3.0.0 before 3.8.0 | CNA record |
OpenSearch OpenSearch Dashboards opensearch:dashboards (from the name) | from 3.0.0 before 3.8.0 | CNA record |
References
- https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.8.0patch
- https://github.com/opensearch-project/OpenSearch-Dashboards/security/advisories/GHSA-xmqx-xq2p-8jq2third-party-advisory
- https://aws.amazon.com/security/security-bulletins/2026-085-aws/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.