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    <lastBuildDate>Wed, 14 Oct 2026 21:49:39 +0000</lastBuildDate>
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      <title>CVE-2026-102989 — TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses</title>
      <link>https://db.gcve.eu/vuln/cve-2026-102989</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; TanStack router, @tanstack react-start, @tanstack solid-start, @tanstack start-server-core, @tanstack vue-start&lt;/p&gt;
&lt;p&gt;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&amp;#39;s origin; when a visitor opens the URL, the injected script can access same-origin data and issue requests with the visitor&amp;#39;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; TanStack router, @tanstack react-start, @tanstack solid-start, @tanstack start-server-core, @tanstack vue-start&lt;/p&gt;
&lt;p&gt;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&amp;#39;s origin; when a visitor opens the URL, the injected script can access same-origin data and issue requests with the visitor&amp;#39;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.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://db.gcve.eu/vuln/cve-2026-102989</guid>
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