{"cve":"CVE-2026-102989","nvd":{"published":"2026-10-13T17:17:14.797","modified":"2026-10-16T16:00:33.533","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","score":9.3},"cwes":["CWE-79"],"references":["https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb","https://github.com/TanStack/router/pull/8573","https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747","https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:52.678897993+00:00"},"epss":{"cve":"CVE-2026-102989","score":0.00544,"percentile":0.45383,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-qx66-fv34-fjm8","url":"https://osv.dev/vulnerability/GHSA-qx66-fv34-fjm8","summary":"TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses","modified":"2026-10-15T20:30:04.544571974Z","packages":[{"ecosystem":"npm","name":"@tanstack/start-server-core","purl":"pkg:npm/%40tanstack/start-server-core","ranges":[">=1.143.12 <1.169.39"],"fixed":["1.169.39"]},{"ecosystem":"npm","name":"@tanstack/react-start","purl":"pkg:npm/%40tanstack/react-start","ranges":[">=1.143.12 <1.168.60"],"fixed":["1.168.60"]},{"ecosystem":"npm","name":"@tanstack/solid-start","purl":"pkg:npm/%40tanstack/solid-start","ranges":[">=1.143.12 <1.168.57"],"fixed":["1.168.57"]},{"ecosystem":"npm","name":"@tanstack/vue-start","purl":"pkg:npm/%40tanstack/vue-start","ranges":[">=1.143.12 <1.168.56"],"fixed":["1.168.56"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}