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TI-2026-58381 Aliases CVE-2026-84942GHSA-r4c3-6c67-qqwx

Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards

Priority LOW 31CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00544 45th percentileScored 2026-11-07
Fix Fixed Amazon OpenSearch Service (AWS): v2.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AWSAmazon OpenSearch Service—v2.3.0Patch availableCNA
OpenSearchOpenSearch Dashboardsv2.0.0 – v3.5.0—No fix listedCNA
  • Amazon OpenSearch Service VendorAWS Affected — Fixed in v2.3.0 Patch available CNA
  • OpenSearch Dashboards VendorOpenSearch Affected v2.0.0 – v3.5.0 Fixed in — No fix listed CNA

Remediation

  • Fix · CNA Amazon OpenSearch Service (AWS) Fixed in v2.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-84942
  2. 2026-10-03 Alias added: GHSA-r4c3-6c67-qqwx

References

Patch 2

Advisory 1

  • TI-2026-23989 crypto: algif_aead - Revert to operating out-of-place KEVCVSS 3.1HIGH 7.8
  • TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
  • TI-2024-18648 Amazon AWS Amplify CLI before 12.10.1 incorrectly configures the role trust policy of IAM… CVSS 3.1CRITICAL 9.8
  • TI-2024-05929 Openssh: regresshion - race condition in ssh allows rce/dos CVSS 3.1HIGH 8.1
  • TI-2025-03847 Input validation issue in AWS Amplify Studio UI component properties CVSS 4.0CRITICAL 9.0
  • TI-2026-11603 HTTP/2 Stream Parser Confusion Body-Inspection Bypass in Amazon CloudFront with AWS WAF CVSS 4.0HIGH 7.9
See all 383 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences