Medium severity · published Jun 2, 2026
CVE-2026-33245
React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets
4.7
CVSS
0.2%
EPSS
No
On KEV
Description
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 8% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
react-router · remix-run
>= 7.7.0, < 7.13.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33245
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33245
Vendor Advisory
https://github.com/remix-run/react-router/security/advisories/GHSA-8646-j5j9-6r62
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