CVE-2026-102989: TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses
An unauthenticated attacker can craft a URL to a server function in an affected TanStack Start app. If someone opens the link, the app can return attacker-controlled HTML from its own origin and run the attacker’s JavaScript there. The script can access same-origin data available to that visitor and make requests with their authority.
References
- github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb
- github.com/TanStack/router/pull/8573
- github.com/TanStack/router/releases/tag/release-2026-09-30-1747
- github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8
- github.com/advisories/GHSA-qx66-fv34-fjm8
- nvd.nist.gov/vuln/detail/CVE-2026-102989
Code Behaviors & Features
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