CVE-2026-21884
Description
React Router is a router for React. In @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, a XSS vulnerability exists in in React Router's API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode () or Data Mode (createBrowserRouter/) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
react-routernpm | >= 7.0.0, < 7.12.0 | 7.12.0 |
@remix-run/reactnpm | < 2.17.3 | 2.17.3 |
Affected products
5- ghsa-coords2 versions
>= 7.0.0, < 7.12.0+ 1 more
- (no CPE)range: >= 7.0.0, < 7.12.0
- (no CPE)range: < 2.17.3
Patches
Vulnerability mechanics
References
13- github.com/advisories/GHSA-8v8x-cx79-35w7ghsaADVISORY
- github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7nvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-21884ghsaADVISORY
- access.redhat.com/errata/RHSA-2026:19712nvdWEB
- access.redhat.com/errata/RHSA-2026:3782nvdWEB
- access.redhat.com/errata/RHSA-2026:3958nvdWEB
- access.redhat.com/errata/RHSA-2026:3960nvdWEB
- access.redhat.com/security/cve/CVE-2026-21884nvdWEB
- bugzilla.redhat.com/show_bug.cginvdWEB
- github.com/remix-run/react-router/blob/react-router%407.12.0/CHANGELOG.mdghsaWEB
- github.com/remix-run/react-router/commit/c89c32c562a7723c45ee71dab1c892acaf7a608dghsaWEB
- github.com/remix-run/react-router/pull/14705ghsaWEB
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.jsonnvdWEB
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