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critical vulnerability

TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

Published Oct 15, 2026 · updated Oct 15, 2026

What to do

  1. Upgrade to a fixed version: @tanstack/start-server-core 1.169.39, @tanstack/react-start 1.168.60, @tanstack/solid-start 1.168.57, @tanstack/vue-start 1.168.56.
  2. Redeploy and restart long-running processes so they load the fixed code.

Affected packages

@tanstack/start-server-core

>= 1.143.12, < 1.169.39
1.169.39

Check your project: npm ls @tanstack/start-server-core --all

Is @tanstack/start-server-core@1.169.39 safe to install? See the upgrade verdict →

@tanstack/react-start

>= 1.143.12, < 1.168.60
1.168.60

Check your project: npm ls @tanstack/react-start --all

Is @tanstack/react-start@1.168.60 safe to install? See the upgrade verdict →

@tanstack/solid-start

>= 1.143.12, < 1.168.57
1.168.57

Check your project: npm ls @tanstack/solid-start --all

Is @tanstack/solid-start@1.168.57 safe to install? See the upgrade verdict →

@tanstack/vue-start

>= 1.143.12, < 1.168.56
1.168.56

Check your project: npm ls @tanstack/vue-start --all

Is @tanstack/vue-start@1.168.56 safe to install? See the upgrade verdict →

Sources

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