Cross-Site Scripting in react-dom

Answer in brief

CVE-2018-6341 records a Medium severity vulnerability in Cross-Site Scripting in react-dom. The current sources do not mark it as known exploited. The current feed maps react-dom (npm), react-dom (npm), react-dom (npm), react-dom (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Jan 4, 2019Updated Sep 13, 2023Source checked Aug 26, 2026First seen by HOL Aug 25, 2026Material review Sep 13, 2023

Upstream Advisory

Key facts

Risk: Medium
Exploitation: Not marked as known exploited
Affected software: 5 mapped packages or products
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 react-dom (npm), react-dom (npm), react-dom (npm), react-dom (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
react-domnpm	=16.0.0	16.0.1
react-domnpm	>=16.1.0,<16.1.2	16.1.2
react-domnpm	=16.2.0	16.2.1
react-domnpm	>=16.3.0,<16.3.3	16.3.3
react-domnpm	>=16.4.0,<16.4.2	16.4.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for react-dom, react-dom, react-dom.
Review the reported fix. Update react-dom to 16.0.1; react-dom to 16.1.2; react-dom to 16.2.1; react-dom to 16.3.3; react-dom to 16.4.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Jan 4, 2019
Evidence: source:ghsa:source_dates:source-dates:record
Source modified
Sep 13, 2023
Evidence: source:ghsa:source_dates:source-dates:record
First seen by HOL
Aug 25, 2026

Sources and claim methodology

Upstream source description

Affected versions of `react-dom` are vulnerable to Cross-Site Scripting (XSS). The package fails to validate attribute names in HTML tags which may lead to Cross-Site Scripting in specific scenarios. This may allow attackers to execute arbitrary JavaScript in the victim's browser. To be affected by this vulnerability, the application needs to: - be a server-side React app - be rendered to HTML using `ReactDOMServer` - include an attribute name from user input in an HTML tag ## Recommendation If you are using `react-dom` 16.0.x, upgrade to 16.0.1 or later. If you are using `react-dom` 16.1.x, upgrade to 16.1.2 or later. If you are using `react-dom` 16.2.x, upgrade to 16.2.1 or later. If you are using `react-dom` 16.3.x, upgrade to 16.3.3 or later. If you are using `react-dom` 16.4.x, upgrade to 16.4.2 or later.

Quoted source text, attributed separately from HOL analysis.