Answer in brief
CVE-2026-102989 records a Critical severity (CVSS 9.3) vulnerability in TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses. The current sources do not mark it as known exploited. The current feed maps @tanstack/react-start (generic), TanStack/router (generic), @tanstack/solid-start (generic), @tanstack/start-server-core (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps @tanstack/react-start (generic), TanStack/router (generic), @tanstack/solid-start (generic), @tanstack/start-server-core (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| @tanstack/react-startgeneric | >=1.143.12 <1.168.60 | 1.168.60 |
| TanStack/routergeneric | <release-2026-09-30-1747 | release-2026-09-30-1747 |
| @tanstack/solid-startgeneric | >=1.143.12 <1.168.57 | 1.168.57 |
| @tanstack/start-server-coregeneric | >=1.143.12 <1.169.39 | 1.169.39 |
| @tanstack/vue-startgeneric | >=1.143.12 <1.168.56 | 1.168.56 |
Published upstream
Oct 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 13, 2026
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.
Quoted source text, attributed separately from HOL analysis.