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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102989
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 17:17:14 UTC
Updated2026-10-14 16:17:30 UTC
DescriptionTanStack 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.

Risk And Classification

Primary CVSS: v3.1 9.3 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

EPSS: 0.005160000 probability, percentile 0.424870000 (date 2026-10-14)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
3.1CNADECLARED9.3CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA TanStack Router affected < release-2026-09-30-1747 Not specified
CNA @tanstack React-start affected >= 1.143.12, < 1.168.60 Not specified
CNA @tanstack Solid-start affected >= 1.143.12, < 1.168.57 Not specified
CNA @tanstack Start-server-core affected >= 1.143.12, < 1.169.39 Not specified
CNA @tanstack Vue-start affected >= 1.143.12, < 1.168.56 Not specified

References

ReferenceSourceLinkTags
github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8 [email protected] github.com
github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb [email protected] github.com
github.com/TanStack/router/releases/tag/release-2026-09-30-1747 [email protected] github.com
github.com/TanStack/router/pull/8573 [email protected] github.com
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