Visualizer < 4.0.8 - Contributor+ Stored XSS via JSON Data Source (CVE-2026-86784) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-86784

Visualizer < 4.0.8 - Contributor+ Stored XSS via JSON Data Source

Answer in brief

CVE-2026-86784 records a Unknown severity vulnerability in Visualizer < 4.0.8 - Contributor+ Stored XSS via JSON Data Source. The current sources do not mark it as known exploited. The current feed maps Unknown/Visualizer (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 16, 2026Updated Sep 16, 2026Source checked Sep 16, 2026First seen by HOL Sep 16, 2026Material review Sep 16, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Visualizer (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Visualizergeneric	>=0 <4.0.8	4.0.8

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Visualizer.
Review the reported fix. Update Unknown/Visualizer to 4.0.8 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 16, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 16, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source description

The Visualizer WordPress plugin before 4.0.8 does not sanitise and escape a chart's JSON data source configuration before outputting it back in the chart editor, allowing users with the Contributor role and above to store JavaScript that executes in the browser of any higher-privileged user, such as an administrator, who reviews the affected chart.

Quoted source text, attributed separately from HOL analysis.