CVE-2026-102989
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.
- CVSS 3.1
- 9.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N - EPSS
- 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)
- CWE
- CWE-79
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-qx66-fv34-fjm8 | npm | @tanstack/start-server-core | >=1.143.12 <1.169.39 | 1.169.39 |
| GHSA-qx66-fv34-fjm8 | npm | @tanstack/react-start | >=1.143.12 <1.168.60 | 1.168.60 |
| GHSA-qx66-fv34-fjm8 | npm | @tanstack/solid-start | >=1.143.12 <1.168.57 | 1.168.57 |
| GHSA-qx66-fv34-fjm8 | npm | @tanstack/vue-start | >=1.143.12 <1.168.56 | 1.168.56 |