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

Type: advisorySource: Official CVE List1 source record

TanStack Router is a client-first, server-capable, fully type-safe router and full-stack framework for the web. From 1.143.12 until 1.169.39 for @tanstack/start-server-core, 1.168.60 for @tanstack/react-start, 1.168.57 for @tanstack/solid-start, and 1.168.56 for @tanstack/vue-start, an unauthenticated attacker can place non-public fields in a server-function request payload so that attacker-controlled middleware state reaches the error path and a response-shaped object is accepted as an HTTP response. A crafted server-function URL can therefore return attacker-controlled HTML from the application's origin; when a visitor opens the URL, the injected script can access same-origin data and issue requests with the visitor's authority. This issue is fixed in @tanstack/start-server-core 1.169.39, @tanstack/react-start 1.168.60, @tanstack/solid-start 1.168.57, and @tanstack/vue-start 1.168.56.

Announced Source revision 1
Original source ↗

CVE-2026-102989

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-102989

router

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

react-start

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

solid-start

Source reference: /containers/cna/affected/2/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

start-server-core

Source reference: /containers/cna/affected/3/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

vue-start

Source reference: /containers/cna/affected/4/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "TanStack",
    "product": "router",
    "versions": [
      {
        "status": "affected",
        "version": "< release-2026-09-30-1747"
      }
    ]
  },
  {
    "vendor": "@tanstack",
    "product": "react-start",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.143.12, < 1.168.60"
      }
    ]
  },
  {
    "vendor": "@tanstack",
    "product": "solid-start",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.143.12, < 1.168.57"
      }
    ]
  },
  {
    "vendor": "@tanstack",
    "product": "start-server-core",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.143.12, < 1.169.39"
      }
    ]
  },
  {
    "vendor": "@tanstack",
    "product": "vue-start",
    "versions": [
      {
        "status": "affected",
        "version": ">= 1.143.12, < 1.168.56"
      }
    ]
  }
]
Related CVEs
CVE-2026-102989

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#22068 · Revision 1
Added to Heist Feed
Publisher date
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