{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-102989", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-09-29T20:46:08.334Z", "datePublished": "2026-10-13T16:13:13.105Z", "dateUpdated": "2026-10-13T16:13:13.105Z"}, "containers": {"cna": {"title": "TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses", "problemTypes": [{"descriptions": [{"cweId": "CWE-79", "lang": "en", "description": "CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8"}, {"name": "https://github.com/TanStack/router/pull/8573", "tags": ["x_refsource_MISC"], "url": "https://github.com/TanStack/router/pull/8573"}, {"name": "https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb", "tags": ["x_refsource_MISC"], "url": "https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb"}, {"name": "https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747", "tags": ["x_refsource_MISC"], "url": "https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747"}], "affected": [{"vendor": "TanStack", "product": "router", "versions": [{"version": "< release-2026-09-30-1747", "status": "affected"}]}, {"vendor": "@tanstack", "product": "react-start", "versions": [{"version": ">= 1.143.12, < 1.168.60", "status": "affected"}]}, {"vendor": "@tanstack", "product": "solid-start", "versions": [{"version": ">= 1.143.12, < 1.168.57", "status": "affected"}]}, {"vendor": "@tanstack", "product": "start-server-core", "versions": [{"version": ">= 1.143.12, < 1.169.39", "status": "affected"}]}, {"vendor": "@tanstack", "product": "vue-start", "versions": [{"version": ">= 1.143.12, < 1.168.56", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-10-13T16:13:13.105Z"}, "descriptions": [{"lang": "en", "value": "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": {"advisory": "GHSA-qx66-fv34-fjm8", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "router", "vendor": "TanStack", "versions": [{"status": "affected", "version": "< release-2026-09-30-1747"}]}, {"product": "react-start", "vendor": "@tanstack", "versions": [{"status": "affected", "version": ">= 1.143.12, < 1.168.60"}]}, {"product": "solid-start", "vendor": "@tanstack", "versions": [{"status": "affected", "version": ">= 1.143.12, < 1.168.57"}]}, {"product": "start-server-core", "vendor": "@tanstack", "versions": [{"status": "affected", "version": ">= 1.143.12, < 1.169.39"}]}, {"product": "vue-start", "vendor": "@tanstack", "versions": [{"status": "affected", "version": ">= 1.143.12, < 1.168.56"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-102989", "lastModified": "2026-10-13T17:17:14.797", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 9.3, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.8, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-10-13T17:17:14.797", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/TanStack/router/commit/d521abd71c69f1ff010bb3def4d417cb5fa058cb"}, {"source": "security-advisories@github.com", "url": "https://github.com/TanStack/router/pull/8573"}, {"source": "security-advisories@github.com", "url": "https://github.com/TanStack/router/releases/tag/release-2026-09-30-1747"}, {"source": "security-advisories@github.com", "url": "https://github.com/TanStack/router/security/advisories/GHSA-qx66-fv34-fjm8"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}