CVE-2018-6341

Severity: medium (CVSS 6.1 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-31 · updated 2026-06-17
Weakness: CWE-79

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.

Affected products

React: from 16.0.0 before 16.0.1; from 16.1.0 before 16.1.2; from 16.2.0 before 16.2.1; from 16.3.0 before 16.3.3; from 16.4.0 before 16.4.2 — fixed in 16.0.1, 16.1.2, 16.2.1, 16.3.3, 16.4.2

How to fix

Upgrade to a fixed version: React 16.0.1, 16.1.2, 16.2.1, 16.3.3. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2018-6341 or the next vulnerability affects your stack