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CVE-2026-102989— TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

Quick assessment

Affected
TanStack router
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TanStack Router 是一个以客户端优先、支持服务端、完全类型安全的路由器及全栈 Web 框架。在 @tanstack/start-server-core 的 1.143.12 至 1.169.39 版本、@tanstack/react-start 的 1.168.60 版本、@tanstack/solid-start 的 1.168.57 版本，以及 @tanstack/vue-start 的 1.168.56 版本中，未经身份验证的攻击者可以在服务端函数（server-function）的请求载荷中放

CVSS 9.3 · Critical

Affected Version Matrix 5

VendorProduct Version RangeStatus
@tanstack react-start >= 1.143.12, < 1.168.60 affected
@tanstack solid-start >= 1.143.12, < 1.168.57 affected
@tanstack start-server-core >= 1.143.12, < 1.169.39 affected
@tanstack vue-start >= 1.143.12, < 1.168.56 affected
TanStack router < release-2026-09-30-1747 affected
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I. Basic Information for CVE-2026-102989

Vulnerability Information
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Vulnerability Title
TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
TanStack router < release-2026-09-30-1747 -
@tanstack react-start >= 1.143.12, < 1.168.60 -
@tanstack solid-start >= 1.143.12, < 1.168.57 -
@tanstack start-server-core >= 1.143.12, < 1.169.39 -
@tanstack vue-start >= 1.143.12, < 1.168.56 -

II. Public POCs for CVE-2026-102989

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III. Intelligence Information for CVE-2026-102989

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Vendor Advisories for CVE-2026-102989 (1)

IV. Related Vulnerabilities

Same product: router
Same vendor: TanStack
Same weakness: CWE-79

V. Comments for CVE-2026-102989

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