PT-2026-103655 · Npm · @Tanstack/Start-Server-Core+1
CVE-2026-102989
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Published
2026-09-30
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Updated
2026-10-02
None
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Name of the Vulnerable Software and Affected Versions
@tanstack/react-start versions 1.143.12 through 1.168.59
Description
A critical reflected Cross-Site Scripting (XSS) issue exists in TanStack Start server-function responses. Reflected XSS occurs when an application includes untrusted data in a web page without proper validation or encoding, allowing an attacker to execute malicious scripts in the victim's browser.
Recommendations
Update @tanstack/react-start to version 1.168.60 or later.
Ensure @tanstack/start-server-core is version 1.169.39 or later.
Do not set the
DANGEROUSLY DEPLOY VULNERABLE TANSTACK START XSS variable. Found an issue in the description? Have something to add? Feel free to write us 👾
Related Identifiers
Affected Products
@Tanstack/React-Start
@Tanstack/Start-Server-Core