Cross-site request forgery in React Router - #VU139176
Published: July 22, 2026
Vulnerability identifier: #VU139176
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-352
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Remix
Affected software:
React Router
React Router
Detailed vulnerability description
The vulnerability allows a remote attacker to execute application actions via cross-site request forgery.
The vulnerability exists due to improper request origin validation in unstable RSC action handling when processing cross-site requests. A remote attacker can cause the victim's browser to send a specially crafted request to execute application actions via cross-site request forgery.
Only applications using the unstable RSC APIs are affected.
Remediation
Install security update from vendor's website.