CVE-2026-84942Stored Cross-Site Scripting via Vega Expression Function Bypass 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 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.
- CVSS
- 8.7 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-79
- 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
- Sep 9, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
AWS Amazon OpenSearch Service aws:amazon_opensearch_service (from the name) | from v2.3.0 through v3.5.0 not affected | CNA record |
OpenSearch OpenSearch Dashboards opensearch:dashboards (from the name) | from v2.0.0 through v3.5.0 | CNA record |
References
- https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/3.6.0patch
- https://github.com/opensearch-project/OpenSearch-Dashboards/releases/tag/2.19.5patch
- https://aws.amazon.com/security/security-bulletins/2026-102-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.