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Vulnerabilities

Vulnerability · CVE-2026-84942

CVE-2026-84942 - Stored Cross-Site Scripting via Vega Expression Function Bypass in OpenSearch Dashboards

Published Sep 9, 2026 · Amazon Web Services

Check if you run it

No confirmed exploitation is on record for CVE-2026-84942. EPSS is 0.54%. Act only if a listed version of Amazon Web Services is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.54%
Remediation
Not established
Affected products
Amazon Web Services

Bulletin ID: 2026-102-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/08/2026 12:30 PM PDT Description: A stored cross-site scripting (XSS) issue 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. Affedted products & versions: OpenSearch Dashboards (open-source,

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-84942

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-84942. EPSS is 0.54%. Act only if a listed version of Amazon Web Services is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 9, 2026 · AWS Security Bulletins

    Detected

    Bulletin ID: 2026-102-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/08/2026 12:30 PM PDT Description: A stored cross-site scripting (XSS) issue 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

Sources

  • AWS Security BulletinsVendor advisoryCVE-2026-84942

    Bulletin ID: 2026-102-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 09/08/2026 12:30 PM PDT Description: A stored cross-site scripting (XSS) issue in the Vega expression function implementation in OpenSearch Dashboards allows a remote authenticated

    aws.amazon.com
  • CVE.orgVulnerability recordCVE-2026-84942

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-84942

    30-day exploitation probability 0.5%

    first.org

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.