CVE-2026-21884 is a cross-site scripting (XSS) vulnerability in React Router's <ScrollRestoration> API, affecting @remix-run/react versions prior to 2.17.3 and react-router versions 7.0.0 through 7.11.0 when using specific props during Server-Side Rendering (SSR). This vulnerability, with a CVSS score of 8.2 (High), allows for arbitrary JavaScript execution if untrusted content is used to generate keys, requiring user interaction and impacting confidentiality. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 7.0.0, <= 7.11.0CPE matchmatch criteria | cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* | ||
< 2.17.3CPE matchmatch criteria | cpe:2.3:a:shopify:remix-run\/react:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.