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CVE-2026-33245 is a potential client-side cross-site scripting vulnerability in React Router affecting versions 7.7.0 through 7.13.1. The issue exists in redirect handling within React Router's unstable React Server Components (RSC) APIs when redirect targets originate from untrusted sources. According to the provided advisory context, attacker-influenced redirect targets, including javascript: URLs, can be processed in a way that leads to script execution in the browser. The issue is limited to applications using the unstable RSC APIs and does not affect applications operating outside that feature set. The vulnerability was patched in React Router 7.13.2.
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A client-side cross-site scripting vulnerability in the unstable React Server Components routing layout of React Router, exploitable via untrusted JavaScript redirect targets.
A client-side cross-site scripting vulnerability in React Router's unstable React Server Components (RSC) redirect handling, affecting versions 7.7.0 through 7.13.1 when redirects originate from untrusted sources.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.