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Vulnerabilities

Vulnerability · CVE-2026-102989

TanStack Router is a client-first, server-capable, fully type-safe router and full-stack framework for the web.

Published Oct 13, 2026 · catalog updated Oct 15, 2026 · TanStack Router is a

Check if you run it

No confirmed exploitation is on record for CVE-2026-102989. EPSS is 0.52%. Act only if a listed version of TanStack Router is a is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (TanStack Router is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.52%
Remediation
Version ranges on file
Affected products
npm @tanstack · npm @tanstack/react-start · npm @tanstack/solid-start · npm @tanstack/start-server-core · npm @tanstack/vue-start

## Impact An unauthenticated attacker can craft a URL to a server function in an affected TanStack Start app. If someone opens the link, the app can return attacker-controlled HTML from its own origin and run the attacker's JavaScript there. The script can access same-origin data available to that visitor and make requests with their authority. ## Cause The server-function transport can pass request payload fields into internal middleware state instead of limiting them to public input fields. A malformed payload can leave an attacker-controlled result in the error path. Response handling can then treat a response-shaped object as an HTTP response. ## Affected versions Published versions of , , , and from up to, but not including, their respective patched versions are affected. The patched versions are , , , and . ## Fix The fix limits client-supplied server-function input to public fields and validates responses at the server boundary. Upgrade to the corresponding patched package version. ## Temporary mitigations For the configured server-function path, usually , an edge or WAF rule can consider blocking requests without the literal header and browser document navigations such as or . A restrictive Content Security Policy on server-function responses can provide another browser-side restriction. These are mitigation suggestions, not a complete fix. The header is client-controlled and is not authentication. Test rules against legitimate GET and POST server functions and use a matching version-specific backport where possible. ## Credits Lovable helped us discover and report this issue. We thank them for their help.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • npm @tanstackversion unspecified
  • npm @tanstack/react-start1.143.12 → 1.168.60
  • npm @tanstack/react-start>= 1.143.12, < 1.168.60
  • npm @tanstack/solid-start1.143.12 → 1.168.57
  • npm @tanstack/solid-start>= 1.143.12, < 1.168.57
  • npm @tanstack/start-server-core1.143.12 → 1.169.39
  • npm @tanstack/start-server-core>= 1.143.12, < 1.169.39
  • npm @tanstack/vue-start1.143.12 → 1.168.56
  • npm @tanstack/vue-start>= 1.143.12, < 1.168.56

How to fix CVE-2026-102989

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-102989. EPSS is 0.52%. Act only if a listed version of TanStack Router is a is installed.

Which versions are affected?

Compare what you have installed with 1.143.12 → 1.168.60, >= 1.143.12, < 1.168.60, 1.143.12 → 1.168.57, >= 1.143.12, < 1.168.57, 1.143.12 → 1.169.39, >= 1.143.12, < 1.169.39. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 0.52%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · NIST NVD

    Detected

    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-contro

  2. Oct 14, 2026 · NIST NVD

    Updated

    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-contro

  3. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @tanstack/start-server-core fixed in 1.169.39; @tanstack/react-start fixed in 1.168.60; @tanstack/solid-start fixed in 1.168.57; @tanstack/vue-start fixed in 1.168.56

  4. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @tanstack/start-server-core fixed in 1.169.39

  5. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @tanstack/react-start fixed in 1.168.60

  6. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @tanstack/solid-start fixed in 1.168.57

  7. Oct 15, 2026 · GitHub Advisory Database

    Fix available

    @tanstack/vue-start fixed in 1.168.56

  8. Oct 15, 2026 · GitHub Advisory Database

    Updated

    ## Impact An unauthenticated attacker can craft a URL to a server function in an affected TanStack Start app. If someone opens the link, the app can return attacker-controlled HTML from its own origin and run the attacker's JavaScript there. The script can access same-origin data available to that visitor and make requests with their authority. ## Cause The server-function transport can pass reque

Sources

  • CVE.orgVulnerability recordCVE-2026-102989

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-102989

    30-day exploitation probability 0.5%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-qx66-fv34-fjm8

    TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-102989

    An unauthenticated attacker can craft a URL to a server function in an affected TanStack Start app. If someone opens the link, the app can return attacker-controlled HTML from its own origin and run the attacker's JavaScript there. The script can access same-origin data available to that visitor and make requests with their authority.

    advisories.gitlab.com
  • NIST NVDVulnerability recordCVE-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-sta

    nvd.nist.gov
  • OpenSSF OSV / OSV ScannerPackage advisoryGHSA-qx66-fv34-fjm8

    TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

    osv.dev

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.