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Vulnerability record · CVE-2018-6341 · published 31 December 2018

CVE-2018-6341: Facebook react cross-site scripting vulnerability

Facebook · React

React applications which rendered to HTML using the ReactDOMServer API were not escaping user-supplied attribute names at render-time. That lack of escaping could lead to a cross-site scripting vulnerability. This issue affected minor releases 16.0.x, 16.1.x, 16.2.x, 16.3.x, and 16.4.x. It was fixed in 16.0.1, 16.1.2, 16.2.1, 16.3.3, and 16.4.2.

6.1 CVSS 3.1 Medium EPSS 3.4% · top 11.5% CWE-79 · Cross-site scripting
6.1CVSS 3.1 base score, v2 4.3
3.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

React applications which rendered to HTML using the ReactDOMServer API were not escaping user-supplied attribute names at render-time. That lack of escaping could lead to a cross-site scripting vulnerability. This issue affected minor releases 16.0.x, 16.1.x, 16.2.x, 16.3.x, and 16.4.x. It was fixed in 16.0.1, 16.1.2, 16.2.1, 16.3.3, and 16.4.2.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://reactjs.org/blog/2018/08/01/react-v-16-4-2.html Vendor Advisory
https://twitter.com/reactjs/status/1024745321987887104 Vendor Advisory
https://reactjs.org/blog/2018/08/01/react-v-16-4-2.html Vendor Advisory
https://twitter.com/reactjs/status/1024745321987887104 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-6341), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.